I am a fan of the Gridwars2 game. If you have problems installing Gridwars2 in Ubuntu, see my post about installing it HERE. I have been successful in installing Gridwars2 in versions from 10.04 to 11.04.
After installing it in a test version of Ubuntu 11.04 Unity install, the sound would not work. I found this solution that worked:
sudo apt-get install alsa-oss
Then, run Gridwars with this command:
If you are not running the command from within the Gridwars directory, adjust the path to point to the Gridwars executable.
Have fun with Gridwars!
— John – K7JM