I have a Macbook Pro 6,2 running OSX 10.6.8, Windows 7, and Ubuntu. I use reFit to be able to choose which one to boot but I've never had a problem with reFit in the past. I was running Ubuntu 11.10, but just upgraded today to 12.04. I'm quite excited to try it out, after hearing about some of the improvements and additions.
I installed and rebooted, and no errors were displayed during this process. After restarting, I edited my grub the way I normally do (I have an option that I enabled on grub that hasn't been working and I keep forgetting to change it, so I have to do it each time on boot). Anyway, the keyboard worked just fine at that point (it had to, because I typed with it), but after hitting ctrl+X and initializing the boot, it seems to stop working. No messages pop up, but then it gets to the login screen and the icons in the top show the "image not found" icon ( http://www.aerotaskforce.com/thumb/Capturar.JPG/w/150 ) and no input devices work. The built-in trackpad does not allow me to move the mouse and doesn't seem to register anything (the mouse is stuck in the middle of the screen), and the keyboard doesn't allow me to type in my password.
So, I had to manually restart by hitting the power button, and this time I chose recovery mode. However, even then, I didn't see any problems. The only error I got was that "pty" failed.
Is there any way I can fix this without having to reinstall the entire OS from scratch?
*EDIT :: *
I determined that this is Unity and not the keyboard drivers, because they work on grub and in command line, when I managed to boot into that. Booted into command line and ran "sudo apt-get -f install" and it ran for about ten minutes, during which I noticed that my fans don't work an Ubuntu anymore either. So, in trying to install the ability to manually control my fans, I determined that my network card is not recognized anymore, either, and I can't apt-get install anything. So, whatever it was, I broke everything.
During the apt-get -f install process, I got this message: "temperature above threshold cpu clock throttled"