Thanks for your bugreport.
Could you please run (in a terminal):
$ ls -l /var/lib/apt/lists/
and attach the output.
The error is a bit odd because the log looks like the sources.list file
was rewriten just fine.
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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Kubuntu 9.04 couldn´t upgrade
https://bugs.launchpad.net/bugs/366297
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