Valve announced porting of its Steam content-distribution platform, Source game engine, and the smash-hit multi-player game title Left 4 Dead 2 (L4D2), to Ubuntu (Linux). The port isn't exactly straightforward, as code has to be rewritten for OpenGL. Valve already accomplished most of this, with its Mac OS X port, which uses the same API.
Valve is targeting just one distribution at this time, to minimize "optimization" overheads. Derivatives such as Mint could run the platform just fine. Valve's immediate goals are to get the Steam client to work on Ubuntu with full functionality, launching Steam for Linux with L4D2 (thanks to SteamPlay, gamers with L4D2 on Windows can play it on Ubuntu without additional purchases); and optimizing L4D2 to get additional frame-rates on Ubuntu. Valve is also work to get its other titles ported to Ubuntu.