Upgrade Crashed, now I can't boot properly

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http://askubuntu.com – So I was upgrading from Ubuntu 11 to 12. The upgrade utility came up and asked and I just let it run in the background while I was coding in the foreground. Anyways! At some point all the "File" bars went missing, but the rest of the GUI was present. I was trying to see what was happening with the upgrade since simple things like alt-tab didn't quite work so I started guessing at key commands to close windows and eventually get back to the upgrade window. Before I had a chance to see it, I was dropped out of Ubuntu's GUI and down to just bash... I figured I should reboot. So I did... Now whe (HowTos)