Add APT, DNF, and Pacman package managers for Linux

src/UniGetUI.Avalonia/Infrastructure/AvaloniaBootstrapper.cs

@@ -148,6 +148,12 @@ private static async Task LoadElevatorAsync()
                 return;
             }
 
+            if (OperatingSystem.IsLinux())
+            {
+                await LoadLinuxElevatorAsync();
+                return;
+            }
+
             if (SecureSettings.Get(SecureSettings.K.ForceUserGSudo))
             {
                 var res = await CoreTools.WhichAsync("gsudo.exe");
@@ -179,6 +185,72 @@ private static async Task LoadElevatorAsync()
         }
     }
 
+    [System.Runtime.Versioning.SupportedOSPlatform("linux")]
+    private static async Task LoadLinuxElevatorAsync()
+    {
+        // Prefer sudo over pkexec: sudo caches credentials on disk (per user, not per
+        // process), so the user is only prompted once per ~15-minute window regardless
+        // of how many packages are installed. pkexec prompts on every single invocation
+        // because polkit ties its authorization cache to the calling process PID.
+        var results = await Task.WhenAll(
+            CoreTools.WhichAsync("sudo"),
+            CoreTools.WhichAsync("pkexec"),
+            CoreTools.WhichAsync("zenity"));
+        var (sudoFound, sudoPath) = results[0];
+        var (pkexecFound, pkexecPath) = results[1];
+        var (zenityFound, zenityPath) = results[2];
+
+        if (sudoFound)
+        {
+            // Find a graphical askpass helper so sudo can prompt without a terminal.
+            // Most DEs (KDE, XFCE, ...) pre-set SSH_ASKPASS to their native tool;
+            // GNOME doesn't, so we fall back to zenity with a small wrapper script
+            // (zenity --password ignores positional args, so it needs the wrapper
+            // to forward the prompt text via --text="$1").
+            string? askpass = null;
+            var envAskpass = Environment.GetEnvironmentVariable("SSH_ASKPASS");
+            if (!string.IsNullOrEmpty(envAskpass) && File.Exists(envAskpass))
+                askpass = envAskpass;
+            else if (zenityFound)
+            {
+                askpass = Path.Join(CoreData.UniGetUIDataDirectory, "linux-askpass.sh");
+                await File.WriteAllTextAsync(askpass,
+                    $"#!/bin/sh\n\"{zenityPath}\" --password --title=\"UniGetUI\" --text=\"$1\"\n");
+                File.SetUnixFileMode(askpass,
+                    UnixFileMode.UserRead | UnixFileMode.UserWrite | UnixFileMode.UserExecute |
+                    UnixFileMode.GroupRead | UnixFileMode.GroupExecute |
+                    UnixFileMode.OtherRead | UnixFileMode.OtherExecute);
+            }
+
+            if (askpass != null)
+            {
+                Environment.SetEnvironmentVariable("SUDO_ASKPASS", askpass);
+                CoreData.ElevatorPath = sudoPath;
+                CoreData.ElevatorArgs = "-A";
+                Logger.Debug($"Using sudo -A with askpass '{askpass}'");
+                return;
+            }
+        }
+
+        // Fall back to pkexec when no usable sudo+askpass combination is found.
+        // pkexec handles its own graphical prompt via polkit but prompts every invocation.
+        if (pkexecFound)
+        {
+            CoreData.ElevatorPath = pkexecPath;
+            Logger.Warn($"Using pkexec at {pkexecPath} (prompts on every operation)");
+            return;
+        }
+
+        if (sudoFound)
+        {
+            CoreData.ElevatorPath = sudoPath;
+            Logger.Warn($"Falling back to sudo without graphical askpass at {sudoPath}");
+            return;
+        }
+
+        Logger.Warn("No elevation tool found (pkexec/sudo). Admin operations will fail.");
+    }
+
     /// <summary>
     /// Checks all ready package managers for missing dependencies.
     /// Returns the list of dependencies whose installation was not skipped by the user.

src/UniGetUI.Avalonia/ViewModels/DialogPages/ManageIgnoredUpdatesViewModel.cs

@@ -108,8 +108,9 @@ private async Task ResetAll()
             await entry.RemoveAsync();
     }
 
-    private static string ResolveManagerIcon(string managerKey) =>
-        (managerKey switch
+    private static string ResolveManagerIcon(string managerKey)
+    {
+        string name = managerKey switch
         {
             "winget" => "winget",
             "scoop" => "scoop",
@@ -123,10 +124,13 @@ private static string ResolveManagerIcon(string managerKey) =>
             "steam" => "steam",
             "gog" => "gog",
             "uplay" => "uplay",
+            "apt" => "apt",
+            "dnf" => "dnf",
+            "pacman" => "pacman",
             _ => "ms_store",
-        }) is var name
-            ? $"avares://UniGetUI.Avalonia/Assets/Symbols/{name}.svg"
-            : $"avares://UniGetUI.Avalonia/Assets/Symbols/ms_store.svg";
+        };
+        return $"avares://UniGetUI.Avalonia/Assets/Symbols/{name}.svg";
+    }
 }
 
 public partial class IgnoredPackageEntryViewModel : ObservableObject

src/UniGetUI.Avalonia/Views/Controls/Settings/SettingsPageButton.cs

@@ -20,7 +20,7 @@ public IconType Icon
     {
         set => HeaderIcon = new SvgIcon
         {
-            Path = $"avares://UniGetUI.Avalonia/Assets/Symbols/{IconTypeToName(value)}.svg",
+            Path = IconTypeToPath(value),
             Width = 24,
             Height = 24,
         };
@@ -32,21 +32,25 @@ public SettingsPageButton()
         IsClickEnabled = true;
     }
 
-    private static string IconTypeToName(IconType icon) => icon switch
+    private static string IconTypeToPath(IconType icon)
     {
-        IconType.Chocolatey => "choco",
-        IconType.Package => "package",
-        IconType.UAC => "uac",
-        IconType.Update => "update",
-        IconType.Help => "help",
-        IconType.Console => "console",
-        IconType.Checksum => "checksum",
-        IconType.Download => "download",
-        IconType.Settings => "settings",
-        IconType.SaveAs => "save_as",
-        IconType.OpenFolder => "open_folder",
-        IconType.Experimental => "experimental",
-        IconType.ClipboardList => "clipboard_list",
-        _ => icon.ToString().ToLower(),
-    };
+        string name = icon switch
+        {
+            IconType.Chocolatey => "choco",
+            IconType.Package => "package",
+            IconType.UAC => "uac",
+            IconType.Update => "update",
+            IconType.Help => "help",
+            IconType.Console => "console",
+            IconType.Checksum => "checksum",
+            IconType.Download => "download",
+            IconType.Settings => "settings",
+            IconType.SaveAs => "save_as",
+            IconType.OpenFolder => "open_folder",
+            IconType.Experimental => "experimental",
+            IconType.ClipboardList => "clipboard_list",
+            _ => icon.ToString().ToLower(),
+        };
+        return $"avares://UniGetUI.Avalonia/Assets/Symbols/{name}.svg";
+    }
 }

src/UniGetUI.Core.Data/CoreData.cs

@@ -370,6 +370,12 @@ public static string UniGetUIExecutableFile
 
         public static string ElevatorPath = "";
 
+        /// <summary>
+        /// Extra arguments to insert between the elevator binary and the elevated command.
+        /// For example, "-A" when using sudo with an askpass helper on Linux.
+        /// </summary>
+        public static string ElevatorArgs = "";
+
         /// <summary>
         /// This method will return the most appropriate data directory.
         /// If the new directory exists, it will be used.

src/UniGetUI.Core.LanguageEngine/Assets/Data/TranslatedPercentages.json

@@ -6,13 +6,13 @@
   "bn": "100%",
   "da": "100%",
   "el": "100%",
-  "eo": "100%",
+  "eo": "99%",
   "es": "100%",
   "es-MX": "100%",
   "et": "100%",
   "fa": "100%",
   "fil": "100%",
-  "gl": "100%",
+  "gl": "99%",
   "gu": "100%",
   "he": "100%",
   "hi": "100%",
@@ -23,10 +23,10 @@
   "ka": "100%",
   "kn": "100%",
   "ko": "100%",
-  "ku": "100%",
+  "ku": "99%",
   "lt": "100%",
   "mk": "100%",
-  "mr": "100%",
+  "mr": "99%",
   "nb": "100%",
   "nn": "100%",
   "pt_PT": "100%",
@@ -58,4 +58,4 @@
   "zh_CN": "100%",
   "zh_TW": "100%",
   "en": "100%"
-}
+}

src/UniGetUI.Core.LanguageEngine/Assets/Languages/lang_en.json

@@ -502,6 +502,9 @@
   "A repository full of tools and executables designed with Microsoft's .NET ecosystem in mind.<br>Contains: <b>.NET related tools and scripts</b>": "A repository full of tools and executables designed with Microsoft's .NET ecosystem in mind.<br>Contains: <b>.NET related tools and scripts</b>",
   "NuPkg (zipped manifest)": "NuPkg (zipped manifest)",
   "The Missing Package Manager for macOS (or Linux).<br>Contains: <b>Formulae, Casks</b>": "The Missing Package Manager for macOS (or Linux).<br>Contains: <b>Formulae, Casks</b>",
+  "The default package manager for Debian/Ubuntu-based Linux distributions.<br>Contains: <b>Debian/Ubuntu packages</b>": "The default package manager for Debian/Ubuntu-based Linux distributions.<br>Contains: <b>Debian/Ubuntu packages</b>",
+  "The default package manager for RHEL/Fedora-based Linux distributions.<br>Contains: <b>RPM packages</b>": "The default package manager for RHEL/Fedora-based Linux distributions.<br>Contains: <b>RPM packages</b>",
+  "The default package manager for Arch Linux and its derivatives.<br>Contains: <b>Arch Linux packages</b>": "The default package manager for Arch Linux and its derivatives.<br>Contains: <b>Arch Linux packages</b>",
   "Node JS's package manager. Full of libraries and other utilities that orbit the javascript world<br>Contains: <b>Node javascript libraries and other related utilities</b>": "Node JS's package manager. Full of libraries and other utilities that orbit the javascript world<br>Contains: <b>Node javascript libraries and other related utilities</b>",
   "Python's library manager. Full of python libraries and other python-related utilities<br>Contains: <b>Python libraries and related utilities</b>": "Python's library manager. Full of python libraries and other python-related utilities<br>Contains: <b>Python libraries and related utilities</b>",
   "PowerShell's package manager. Find libraries and scripts to expand PowerShell capabilities<br>Contains: <b>Modules, Scripts, Cmdlets</b>": "PowerShell's package manager. Find libraries and scripts to expand PowerShell capabilities<br>Contains: <b>Modules, Scripts, Cmdlets</b>",

src/UniGetUI.Core.Tools/Tools.cs

@@ -505,12 +505,29 @@ public static async Task CacheUACForCurrentProcess()
             {
                 _isCaching = true;
                 Logger.Info("Caching admin rights for process id " + Environment.ProcessId);
+
+                var elevatorName = Path.GetFileName(CoreData.ElevatorPath);
+
+                // pkexec prompts on every invocation and has no caching protocol.
+                if (elevatorName == "pkexec")
+                {
+                    _isCaching = false;
+                    return;
+                }
+
+                // sudo: -v validates/extends the cached timestamp.
+                // Prepend -A only when the SUDO_ASKPASS helper is configured.
+                // gsudo / UniGetUI Elevator.exe: use the gsudo cache protocol.
+                string cacheArgs = elevatorName == "sudo"
+                    ? (CoreData.ElevatorArgs.Contains("-A") ? "-Av" : "-v")
+                    : "cache on --pid " + Environment.ProcessId + " -d 1";
+
                 using Process p = new()
                 {
                     StartInfo = new ProcessStartInfo
                     {
                         FileName = CoreData.ElevatorPath,
-                        Arguments = "cache on --pid " + Environment.ProcessId + " -d 1",
+                        Arguments = cacheArgs,
                         UseShellExecute = false,
                         RedirectStandardOutput = true,
                         RedirectStandardError = true,
@@ -546,12 +563,27 @@ public static async Task ResetUACForCurrentProcess()
             Logger.Info(
                 "Resetting administrator rights cache for process id " + Environment.ProcessId
             );
+
+            var elevatorName = Path.GetFileName(CoreData.ElevatorPath);
+
+            // pkexec prompts on every invocation and has no caching protocol.
+            if (elevatorName == "pkexec")
+            {
+                return;
+            }
+
+            // sudo: -K removes all cached timestamps.
+            // gsudo / UniGetUI Elevator.exe: use the gsudo cache protocol.
+            string resetArgs = elevatorName == "sudo"
+                ? "-K"
+                : "cache off --pid " + Environment.ProcessId;
+
             using Process p = new()
             {
                 StartInfo = new ProcessStartInfo
                 {
                     FileName = CoreData.ElevatorPath,
-                    Arguments = "cache off --pid " + Environment.ProcessId,
+                    Arguments = resetArgs,
                     UseShellExecute = false,
                     RedirectStandardOutput = true,
                     RedirectStandardError = true,

src/UniGetUI.Interface.Enums/Enums.cs

@@ -85,6 +85,9 @@ public enum IconType
         Rust = '\uE941',
         Vcpkg = '\uE942',
         Homebrew = '\uE943',
+        Apt = '\uE944',
+        Dnf = '\uE945',
+        Pacman = '\uE946',
     }
 
     public class NotificationArguments