Comment 4 for bug 990870

I (unfortunately) cannot provide any additional debugging info, as I've switched to Debian Wheezy for this workstation.

There appear to be others having the same issue. Some suggestions include running "sudo apt-get -f install", which seems to fix it in xorg, but not in pre-boot. It's as if USB is not getting initialized in the initram. Some URLS are as follows:

http://askubuntu.com/questions/128513/mouse-and-keyboard-does-not-work-after-upgrade-to-12-04
http://askubuntu.com/questions/127410/upgrading-to-ubuntu-12-04-loses-keyboard-and-mouse

Googling "ubuntu 12.04 usb keyboard" brings up more.

I'm sorry that I can't provide any additional info at this point, but my occupation prohibits me from having a down primary workstation. I will see if I can acquire an additional ThinkPad today to provide additional debugging info from.