Mono is completely installed by default on older versions of Ubuntu (8-11). The runtime with some development tools is installed in 12 and 13. You can get it

Mono is completely installed by default on older versions of Ubuntu (8-11). The runtime with some development tools is installed in 12 and 13. You can get it on any version since 8 with apt-get. $ sudo apt-get mono-complete $ echo "using System; static class Entry { static void Main() { Console.WriteLine(\"Hello World\"); }}" > hello.cs $ mono-csc hello.cs $ ./hello.exe Hello World