Public bug reported:

I got the following error when trying to upgrade from Feisty to Gutsy:
"The system was unable to get the prerequisites for the upgrade. The upgrade 
will abort now and restore the original system state.

Please report this as a bug against the 'update-manager' package and
include the files in /var/log/dist-upgrade/ in the bugreport."

The only log file that has anything in it is the main.log:
# more main.log
2007-10-18 08:38:05,662 INFO release-upgrader version '0.81' started
2007-10-18 08:38:06,054 DEBUG lsb-release: 'feisty'
2007-10-18 08:38:06,054 DEBUG _pythonSymlinkCheck run
2007-10-18 08:38:06,826 DEBUG checkViewDepends()
2007-10-18 08:38:06,826 DEBUG getRequiredBackports()
2007-10-18 08:38:06,827 ERROR IOError in cache.update(): 'Failed to lock /var/li
b/apt/lists/lock'. Retrying (currentRetry: 0)
2007-10-18 08:38:06,828 ERROR IOError in cache.update(): 'Failed to lock /var/li
b/apt/lists/lock'. Retrying (currentRetry: 1)
2007-10-18 08:38:06,828 ERROR IOError in cache.update(): 'Failed to lock /var/li
b/apt/lists/lock'. Retrying (currentRetry: 2)
2007-10-18 08:38:06,828 ERROR doUpdate() failed complettely
2007-10-18 08:38:07,622 ERROR Can not find backport 'release-upgrader-apt'
# 
looks like a collision between 2 different packagers...

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
Upgrade from 7.04 to 7.10 Fails
https://bugs.launchpad.net/bugs/153946
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