Recover from Shutdown during Ubuntu Upgrade

Problems updating your Ubuntu installation. Read on.(from http://serverfault.com/questions/8540/recover-from-shutdown-during-ubuntu-distribution-upgrade, viewed June 2011)

I have a computer which was unexpectedly shut down during a distribution upgrade (Ubuntu 8.10 -> 9.04). It now won't finish booting - various X errors, then it goes to the login screen but won't allow logins. I have a backup of it and the /home data is all still OK on the drive so it's no emergency, but a complete rebuild is still an annoying and time consuming process.

The upgrade was recovered using something like this:

sudo dpkg --configure -a 
sudo apt-get update 
sudo dpkg --configure -a 
sudo dpkg --configure -a --abort-after=99999 
sudo apt-get dist-upgrade 
sudo apt-get -f install 
sudo apt-get dist-upgrade

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