Is the Avalonia nuget source down? #21814

hhyyrylainen · 2026-07-21T14:36:44Z

hhyyrylainen
Jul 21, 2026

I'm trying to build Avalonia for the first time in a few years and I'm getting a bunch of nuget restore errors and errors trying to install workloads. Directly going to https://nuget.avaloniaui.net shows a 521 error, which is probably why nuget restore fails? So is the website down or do I somehow have some outdated URL somewhere that points to a thing that no longer exists?

Answered by hhyyrylainen

Jul 21, 2026

Ah, now I realized what went wrong, I was still on the master branch and pulled that up to date but this repo now has "main" as the main branch so I had to swap to that to get the nuke build settings file correct. It was actually pointing to .Net Core 3.1 for me and I could not find that old SDK so I manually patched it to .net6.0 to get it to run, which is why it was using that SDK.

I've now swapped to the main branch and got farther / different errors. But ultimately I decided to re-clone this repository and now I was able to build. So yeah the problem was that I had outdated stuff locally.

So after that I did get farther but now I get a bunch of errors (which might be that my dotnet SD…

View full answer

LaurentInSeattle · 2026-07-21T14:56:24Z

LaurentInSeattle
Jul 21, 2026

Why not use this one: https://www.nuget.org/packages/Avalonia

1 reply

hhyyrylainen Jul 21, 2026
Author

Because that's what the compilation process does, at least for me (a bit cut output):

./build.sh --configuration Debug
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls.DataGrid/Avalonia.Controls.DataGrid.csproj (in 6,41 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj (in 6,51 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Base/Avalonia.Base.csproj (in 6,51 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj (in 6,51 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Diagnostics/Avalonia.Diagnostics.csproj (in 6,51 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Remote.Protocol/Avalonia.Remote.Protocol.csproj (in 6,51 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup/Avalonia.Markup.csproj (in 6,44 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Desktop/Avalonia.Desktop.csproj (in 6,41 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj (in 6,51 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Fluent/Avalonia.Themes.Fluent.csproj (in 6,51 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Dialogs/Avalonia.Dialogs.csproj (in 6,51 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Default/Avalonia.Themes.Default.csproj (in 6,44 sec).
  Failed to restore /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls/Avalonia.Controls.csproj (in 6,41 sec).
  48 of 62 projects are up-to-date for restore.

Build FAILED.

/home/hhyyrylainen/.dotnet/sdk/6.0.302/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp2.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy. [/home/hhyyrylainen/Projects/Avalonia/src/tools/Avalonia.Designer.HostApp/Avalonia.Designer.HostApp.csproj]                                                                                                                                                                        
/home/hhyyrylainen/.dotnet/sdk/6.0.302/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp2.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy. [/home/hhyyrylainen/Projects/Avalonia/packages/Avalonia/Avalonia.csproj]                                                                                                                                                                                                           
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls/Avalonia.Controls.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls.DataGrid/Avalonia.Controls.DataGrid.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Desktop/Avalonia.Desktop.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls.DataGrid/Avalonia.Controls.DataGrid.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Fluent/Avalonia.Themes.Fluent.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Default/Avalonia.Themes.Default.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup/Avalonia.Markup.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls/Avalonia.Controls.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Base/Avalonia.Base.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Desktop/Avalonia.Desktop.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Remote.Protocol/Avalonia.Remote.Protocol.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Dialogs/Avalonia.Dialogs.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Default/Avalonia.Themes.Default.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup/Avalonia.Markup.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Fluent/Avalonia.Themes.Fluent.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Base/Avalonia.Base.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Diagnostics/Avalonia.Diagnostics.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Diagnostics/Avalonia.Diagnostics.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Dialogs/Avalonia.Dialogs.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Remote.Protocol/Avalonia.Remote.Protocol.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
    2 Warning(s)
    26 Error(s)

Time Elapsed 00:00:10.93
ProcessException: Process 'dotnet' exited with code 1.
   > /home/hhyyrylainen/.dotnet/dotnet build /home/hhyyrylainen/Projects/Avalonia/dirs.proj --configuration Debug /property:PackageVersion=0.10.999                                                                                                                                                                   
   @ /home/hhyyrylainen/Projects/Avalonia                                                                                                                                                                                                                                                                             
                                                                                                                                                                                                                                                                                                                      
   at Nuke.Common.Tooling.ProcessExtensions.AssertZeroExitCode(IProcess process)
   at Nuke.Common.Tools.DotNet.DotNetTasks.DotNetBuild(DotNetBuildSettings toolSettings)                                                                                                                                                                                                                              
   at Nuke.Common.Tools.DotNet.DotNetTasks.DotNetBuild(Configure`1 configurator)                                                                                                                                                                                                                                      
   at Build.<get_Compile>b__15_1() in /home/hhyyrylainen/Projects/Avalonia/nukebuild/Build.cs:line 161                                                                                                                                                                                                                
   at Nuke.Common.Execution.TargetDefinition.<>c__DisplayClass62_0.<Executes>b__0()                                                                                                                                                                                                                                   
   at Nuke.Common.Execution.BuildExecutor.<>c.<Execute>b__4_0(Action x)                                                                                                                                                                                                                                               
   at Nuke.Common.Utilities.Collections.EnumerableExtensions.ForEach[T](IEnumerable`1 enumerable, Action`1 action)                                                                                                                                                                                                    
   at Nuke.Common.Execution.BuildExecutor.Execute(NukeBuild build, ExecutableTarget target, IReadOnlyCollection`1 previouslyExecutedTargets, Boolean failureMode)                                                                                                                                                     
                                                                                                                                                                                                                                                                                                                      

Repeating warnings and errors:
tsconfig-paths-webpack-plugin: Using config file at /home/hhyyrylainen/Projects/Avalonia/src/Avalonia.DesignerSupport/Remote/HtmlTransport/webapp/tsconfig.json
/home/hhyyrylainen/.dotnet/sdk/6.0.302/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp2.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy. [/home/hhyyrylainen/Projects/Avalonia/src/tools/Avalonia.Designer.HostApp/Avalonia.Designer.HostApp.csproj]                                                                                                                                                                        
/home/hhyyrylainen/.dotnet/sdk/6.0.302/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp2.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy. [/home/hhyyrylainen/Projects/Avalonia/packages/Avalonia/Avalonia.csproj]                                                                                                                                                                                                           
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls/Avalonia.Controls.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls.DataGrid/Avalonia.Controls.DataGrid.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Desktop/Avalonia.Desktop.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls.DataGrid/Avalonia.Controls.DataGrid.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Fluent/Avalonia.Themes.Fluent.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Default/Avalonia.Themes.Default.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup/Avalonia.Markup.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls/Avalonia.Controls.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Base/Avalonia.Base.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Desktop/Avalonia.Desktop.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Remote.Protocol/Avalonia.Remote.Protocol.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Dialogs/Avalonia.Dialogs.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Default/Avalonia.Themes.Default.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup/Avalonia.Markup.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Fluent/Avalonia.Themes.Fluent.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Base/Avalonia.Base.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Diagnostics/Avalonia.Diagnostics.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Diagnostics/Avalonia.Diagnostics.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Dialogs/Avalonia.Dialogs.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Remote.Protocol/Avalonia.Remote.Protocol.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/.dotnet/sdk/6.0.302/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp2.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy. [/home/hhyyrylainen/Projects/Avalonia/src/tools/Avalonia.Designer.HostApp/Avalonia.Designer.HostApp.csproj]                                                                                                                                                                        
/home/hhyyrylainen/.dotnet/sdk/6.0.302/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp2.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy. [/home/hhyyrylainen/Projects/Avalonia/packages/Avalonia/Avalonia.csproj]                                                                                                                                                                                                           
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls/Avalonia.Controls.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls.DataGrid/Avalonia.Controls.DataGrid.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Desktop/Avalonia.Desktop.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls.DataGrid/Avalonia.Controls.DataGrid.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Fluent/Avalonia.Themes.Fluent.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Default/Avalonia.Themes.Default.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup/Avalonia.Markup.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Controls/Avalonia.Controls.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Base/Avalonia.Base.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Desktop/Avalonia.Desktop.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Remote.Protocol/Avalonia.Remote.Protocol.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Dialogs/Avalonia.Dialogs.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup.Xaml/Avalonia.Markup.Xaml.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Default/Avalonia.Themes.Default.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Markup/Avalonia.Markup/Avalonia.Markup.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Themes.Fluent/Avalonia.Themes.Fluent.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Base/Avalonia.Base.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Diagnostics/Avalonia.Diagnostics.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Diagnostics/Avalonia.Diagnostics.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Dialogs/Avalonia.Dialogs.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.DesignerSupport/Avalonia.DesignerSupport.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.ReactiveUI/Avalonia.ReactiveUI.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
/home/hhyyrylainen/Projects/Avalonia/src/Avalonia.Remote.Protocol/Avalonia.Remote.Protocol.csproj : error NU1301: Unable to load the service index for source https://nuget.avaloniaui.net/repository/avalonia-devdeps/index.json. [/home/hhyyrylainen/Projects/Avalonia/dirs.proj]
ProcessException: Process 'dotnet' exited with code 1.
   > /home/hhyyrylainen/.dotnet/dotnet build /home/hhyyrylainen/Projects/Avalonia/dirs.proj --configuration Debug /property:PackageVersion=0.10.999                                                                                                                                                                   
   @ /home/hhyyrylainen/Projects/Avalonia                                                                                                                                                                                                                                                                             
                                                                                                                                                                                                                                                                                                                      

═════════════════════════════════════════════
Target                   Status      Duration
─────────────────────────────────────────────
GenerateCppHeaders       Executed        0:00
Clean                    Executed        0:00
CompileNative            Skipped         0:00   // EnvironmentInfo.IsOsx
CompileHtmlPreviewer     Executed        0:04
Compile                  Failed          0:11
RunLeakTests             Skipped         0:00   // (Not(Parameters.SkipTests) && Parameters.IsRunningOnWindows)
RunDesignerTests         Skipped         0:00   // (Not(Parameters.SkipTests) && Parameters.IsRunningOnWindows)
RunRenderTests           NotRun          0:00
RunCoreLibsTests         NotRun          0:00
RunHtmlPreviewerTests    NotRun          0:00
RunTests                 NotRun          0:00
─────────────────────────────────────────────
Total                                    0:15
═════════════════════════════════════════════

Build failed on 21.7.2026 18.38.03. (╯°□°）╯︵ ┻━┻

And I realized I should have read the build documentation first, but it does say on that page that ./build.sh --configuration Debug should be a supported way to compile things, but it doesn't work for me due to that nuget sources load error.

LaurentInSeattle · 2026-07-21T16:39:56Z

LaurentInSeattle
Jul 21, 2026

.Net 6 is not supported any longer - Min version is now 8 for Avalonia

1 reply

hhyyrylainen Jul 21, 2026
Author

Ah, now I realized what went wrong, I was still on the master branch and pulled that up to date but this repo now has "main" as the main branch so I had to swap to that to get the nuke build settings file correct. It was actually pointing to .Net Core 3.1 for me and I could not find that old SDK so I manually patched it to .net6.0 to get it to run, which is why it was using that SDK.

I've now swapped to the main branch and got farther / different errors. But ultimately I decided to re-clone this repository and now I was able to build. So yeah the problem was that I had outdated stuff locally.

So after that I did get farther but now I get a bunch of errors (which might be that my dotnet SDK is too old but I cannot update it easily before it gets into Fedora):

19:57:09 [DBG]   34 packages installed [12.00ms]
19:57:09 [ERR] /home/hhyyrylainen/Projects/Avalonia/src/tools/Avalonia.Generators/Common/Domain/INameResolver.cs(3,7): error CS0246: The type or namespace name 'XamlX' could not be found (are you missing a using directive or an assembly reference?) [/home/hhyyrylainen/Projects/Avalonia/src/tools/Avalonia.Generators/Avalonia.Generators.csproj]
19:57:09 [ERR] /home/hhyyrylainen/Projects/Avalonia/src/tools/Avalonia.Generators/Common/Domain/INameResolver.cs(4,7): error CS0246: The type or namespace name 'XamlX' could not be found (are you missing a using directive or an assembly reference?) [/home/hhyyrylainen/Projects/Avalonia/src/tools/Avalonia.Generators/Avalonia.Generators.csproj]

And there are hundreds of XamlX errors. So I guess that's the next thing I need to look a fix for...

Edit: the XamlX errors where that I forgot to reinit git submodules after the new clone.

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