12.04 is not stable 🙂 you might have better luck after updating.

Regarding the FPS you get, 1.8fps means you are not running on the Nvidia card.

I haven’t tried to install on 32bit Linux and I don’t have any plans to – sorry. This is basically my work laptop so once I got it going, I’m not going to play with it much more because I need to get some work done 🙂