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The login screen still says Ubuntu 11.10. Needless to say, the upgrade was interrupted. I was able to continue the interrupted upgrade and get a stable machine.

lsb_release -a tells me its 12.04.

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2 Answers

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You could try, in a terminal:sudo apt-get update && sudo apt-get dist-upgrade Which may help, or at least give some clues.

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Oh, I did not know of the sudo apt-get dist-upgrade command. All I was doing was sudo apt-get upgrade and sudo apt-get install -f – theTuxRacer Apr 29 '12 at 14:56
sudo apt-get update (not upgrade) updates the data on which updates are available. sudo apt-get dist-upgrade gets and applies all the updates. does that mean it is all ok now? – clanlaw Apr 29 '12 at 21:06
Yes, its resolved now. Although what was worrying is that the screen blanked out a few times and I had to log into a tty to kill gnome-session and wait until the CPU processing stopped, restart, then continue again. I hope others aren't having the same problem. – theTuxRacer Apr 30 '12 at 3:37
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Try:

sudo apt-get update
sudo apt-get install lightdm
sudo dpkg-reconfigure lightdm
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