What a silly question is this. How is this possible to play this game on Ubuntu without the wine emulator. For playing FSO you must have use wine emulator for this purpose.
Ummm. As Fisk posted, there is definitely a Linux version that works without the need for emulation.
Also, this is a three-year-old thread. Please don't post in such old threads, unless you're providing real, useful, new, relevant information.
That said, it's nice to have another real person here (assuming you are real, which I will do). So
Unfortunately, game-warden is a little dead right now, I suggest you move on over to hard-light.net, the current source for all things FreeSpace.