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ModernUO Discord Subreddit subscribers Twitter Follow Gitter

Ultima Online Server Emulator for the modern era!

GitHub license GitHub stars GitHub issues
GitHub build AzurePipelines build


Supported Operating Systems

Windows 10/11/2016/2019/2022 MacOS 10.15/11/12 Debian 10/11 Ubuntu 16/18/20 LTS Linux Mint 17/18/19/20 CentOS 7/8 Fedora 32/33/34/35/36 RedHat 7/8

Running the server



git .NET

Supported IDEs

    Jetbrains Rider 2021.3                           Visual Studio 2022
Rider 2021.3+             Visual Studio 2022+

Note: VS Code is not currently supported.

Getting Started

  • Install prerequisite requirements
  • Clone this repository (or download the latest):
    • git clone
  • Open ModernUO.sln to start developing


  • Run ./publish.cmd [release|debug (default: release)] [os]
    • os - Supported operating systems
      • win - Windows 10/11/2016/2019/2022
      • osx - MacOS 10.15/11.0+/12.0+ (Catalina, Big Sur, Monterey)
      • ubuntu.16.04, ubuntu.18.04 ubuntu.20.04 - Ubuntu LTS
      • linuxmint.17, linuxmint.18, linuxmint.19 - Linux Mint
      • debian.10, debian.11 - Debian
      • centos.7, centos.8 - CentOS
      • fedora.32, fedora.33, fedora.34, fedora.35, fedora.36 - Fedora
      • rhel.7, rhel.8 - Redhat
      • If blank, the operating system running the build is used. Linux Mint 20 is not supported directly yet, so build explicitly against ubuntu.20.04 instead.

Running the Server

  • Follow the publish instructions
  • Run ModernUO.exe or dotnet ModernUO.dll from the Distribution directory on the server

Note: If you are running a version of linux that isn't listed above, then you may have to install the following using a package manager:

  • libargon2-dev, libz-dev, and zstd


  • RunUO Team & Community
  • Voxpire, the ServUO Team & Community
  • Karasho, Jaedan and the ClassicUO Community

Troubleshooting / FAQ

Want to sponsor?

Thank you for supporting us! You can find out how by visiting the sponsors page.

Development Tools & Plugins provided with by
JetBrains Material Theme