Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
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## Why `IORingGroup` issues io_uring syscalls directly rather than linking `liburing`, so the package has never been needed — but we ask operators to install it in the README, install it in CI, and check for it in `build-tool`. Verified against the **shipped** `IORingGroup` 1.0.9 assembly, not just the source: | Symbol | Occurrences in `IORingGroup.dll` | |---|---| | `libc`, `libSystem.dylib`, `kernel32.dll`, `kernelbase.dll`, `ws2_32.dll` | present | | `liburing` | **0** | | `io_uring_queue_init` — liburing's entry point | **0** | | `io_uring_setup` — the raw syscall | 1 | If it linked liburing it would call `io_uring_queue_init` / `io_uring_submit`. It calls neither. ## What changes Nine lines across three files, removing `liburing-dev` / `liburing-devel` from: - `README.md` — both the dnf and apt prerequisite blocks - `.github/workflows/build-test.yml` — both install steps - `Projects/BuildTool/Prerequisites/NativeLibraryChecker.cs` — the cross-compile target text, the apt and dnf package lists, and the `ldconfig` fallback map Nothing else is touched. `zstd` and the `-dev` packages are a separate discussion and a separate PR. ## Risk None to the build. `liburing` was only ever installed, never linked or loaded — removing it cannot change resolution behaviour. `build-tool` builds clean. This was found while investigating why Linux requires `-dev` packages at all; that fix lives in the binding packages (modernuo/LibDeflate.Bindings#4, modernuo/Argon2.Bindings#13) and lands separately once those publish. This piece is independent and unblocked, hence its own PR. |
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| .config | ||
| .github | ||
| branding | ||
| dev-docs | ||
| Distribution/Data | ||
| Projects | ||
| tools | ||
| .cursorrules | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| AGENTS.md | ||
| azure-pipelines.yml | ||
| CLAUDE.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| GEMINI.md | ||
| global.json | ||
| LICENSE | ||
| ModernUO.slnx | ||
| publish.cmd | ||
| publish.ps1 | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
| stylecop.json | ||
| THIRD-PARTY-NOTICES | ||
| version.json | ||
ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
Interactive Mode (Recommended for new users)
Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:
- Check prerequisites (.NET SDK, native libraries)
- Walk you through configuration and platform selection
- Build and publish the server to the
Distributiondirectory - Show deployment instructions for cross-compiled builds
Command Line
./publish.cmd [release|debug] [os] [arch]
os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit
Linux Prerequisites
Fedora, CentOS, RHEL, AlmaLinux, Rocky, etc
dnf upgrade --refresh -y
# RHEL-family distributions (CentOS Stream, AlmaLinux, Rocky, RHEL) need CRB and EPEL enabled.
# Fedora skips this block.
dnf install -y dnf-plugins-core
dnf config-manager --set-enabled crb
dnf install -y epel-release
# Prerequisites
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev
OSX Requirements
brew install icu4c libdeflate zstd argon2
Running the Server
- Follow the publish instructions
- The
Distributiondirectory is portable — copy it to your production server for deployment - Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory - On first run, the server will prompt you to configure game data file locations
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community
Development Tools & Plugins provided with ♥ by
Code Signing Policy
Free code signing provided by SignPath.io, certificate by SignPath Foundation.
This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it
Teams & Roles
Approvers & Committers: Development Team