After an GUI upgrade from 11.10 to 12.04 my machine:
1. Does not detect any USB devices regardless of port.
2. There is no network access, so I can not SSH in.
3. The machine is not showing up on my router.
4. On startup I go straight to the login page, and can do nothing else.

I have tried several hard reboots, with no success. All issues are new after the upgrade.

Any help is appreciated.