I encountered the same problem on Xubuntu; upgrades that aren't completed for 
one reason or another can seriously break the system :( I used the alternative 
installer cd, and opened an emergency rescue shell on /dev/hda1. After a lot of 
questions, I got a root prompt chrooted to the harddisk, and was able to 
complete part of the installation. By doing
  dpkg --configure -a
  apt-get -f install
any interrupted package installation was corrected. This made the system 
bootable again (that is, created the initrd image). After the system booted 
from the harddisk correctly, a system update installed some more packages. 
do-release-upgrade didn't want to finish the upgrade (and it had no man page!), 
so I hope specific upgrade procedures were finished. But the system seems to be 
working correctly again.

Maybe we need a description or link describing how to repair an
interrupted distribution upgrade.

-- 
Xubuntu upgrade from Feisty to Gutsy fails if screensaver turns on
https://bugs.launchpad.net/bugs/154377
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