Comment 51 for bug 433438

I'm on Ubuntu 13.04 and I just got something similar happening to what the original submitter reported.

The system took 2 minutes to boot (as opposed to 10 seconds usually) and the mouse and keyboard didn't respond when the greeter appeared. I unplugged and replugged the mouse and keyboard, and they still didn't work. Some time later they started working on their own though.

Let me know if you'd like the dmesg log.