As of today, when I boot into Ubuntu (i'm dual-booting Mountain Lion and Ubuntu 12.04) on my MacBook Pro 3,1 my keyboard doesn't work at all. It's not a problem with the text field, though, because I enabled the on-screen clickable keyboard through accessibility and was able to log in. However, the keyboard still didn't work! I have one idea for what MIGHT have caused it, and that was that my keyboard backlight was on when I shut down from Mountain Lion, but I haven't had a chance to try shutting down without it on. I'm going to try that right after I post this and reply with the result.

I also just posted a thread about my audio problem, which I would appreciate if you checked out.