Ok, so I recently installed Ubuntu 12.10 to upgrade from the older version I had, which was still Narwhal.

The issue: Upon being ticked at Lugaru's non-mouse-capturing window (it's a game with ninja rabbits and stuff), I went searching for a config file of sorts to change that. I found the file, but since it was under /usr/games, I couldn't edit it. So instead of just changing the specific file and it's directory to my ownership via sudo chown, I changed the entire /usr directory.

Yeah. I'm an idiot.

Anyways, I got the sudo command back and I *think* I reset the rest of the permissions back to normal, but everything is still royaly borked to high heaven. I now have to use the alsamixer command to change my sound, as there is no icon on the upper bar. Also, I always get the "system has encountered an error" message, and a few other errors. On top of all that, the little shutdown/gear symbol used to logout, shutdown, reboot, etc. now shows absolutely nothing when clicked upon.

I know that I could and probably should reinstall my Ubuntu, but is there anyway to nurse my Ubuntu back to health?

Thanks for your time,