I'm using OpenSuSe . I don't think it has something to do with the graphical card since I could play 3D games such as tremulous and Sauerbraten which requires high graphical performances.When I click on "OK" , it says " connecting to the server , please wait.." for about 5 secs and then the the game disappears and I get back to the desktop.
I tested the game on my brother's Windows XP box , and it worked perfectly .