Valve keeps porting their games to Linux for the Steam OS and now you can play CS:GO as well, there was no official statement yet but you can just open up Steam on Linux and see that the game is going to work just fine. Global Offensive supports SteamPlay which means you just have to buy one copy of the game to play it on Windows, Mac and Linux.
Source: OMG Ubuntu
FAKE
The penguin doesn’t need a weapon to defend himself.