I got the same error trying to upgrade from Feisty to Gutsy today:

the two files main.log and apt.log are in attachment as well as a print
screen of the error.

Here is the copy paste of the Traceback (most recent call last):

Traceback (most recent call last):

  File "/usr/bin/update-manager", line 86, in <module>
    view.hideStep(STEP_REBOOT)

  File "/usr/lib/python2.5/site-packages/DistUpgrade/DistUpgradeControler.py", 
line 664, in doPostUpgrade
    #      but as good as we can do currently + savety buffer

  File "/usr/lib/python2.5/site-packages/DistUpgrade/DistUpgradeControler.py", 
line 160, in openCache
    self.forced_obsoletes = self.config.getlist("Distro","ForcedObsoletes")

  File "/usr/lib/python2.5/site-packages/DistUpgrade/DistUpgradeCache.py", line 
22, in __init__
    class CacheException(Exception):

  File "/usr/lib/python2.5/site-packages/apt/cache.py", line 39, in __init__
    """ Dictionary-like package cache

  File "/usr/lib/python2.5/site-packages/apt/cache.py", line 52, in open
    """ internal helper to run a callback """

SystemError: E:Malformed 3rd word in the Status line, E:Error occurred
while processing libc6 (UsePackage2), E:Problem with MergeList
/var/lib/dpkg/status, E:The package lists or status file could not be
parsed or opened.

** Attachment added: "screenshot of the fatal error"
   http://launchpadlibrarian.net/10068964/fatalerror_upgrade.png

-- 
a fatal error of dist-upgrade at Gutsy
https://bugs.launchpad.net/bugs/121267
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