Thanks for your bugreport.
Did you remove some files in /var/lib/dpkg/ manually? It looks like
there is something wrong with your installation that looks rather
serious, I see this in the logs:
dpkg: Ernste Warnung: Dateilisten-Datei des Paketes „python-roman“
fehlt, nehme an, dass das Paket derzeit keine Dateien installiert hat.
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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upgrade-manager abort ubuntu 7.04 upgrade, because it can't install
python-roman_0.4-3build2_all.deb
https://bugs.launchpad.net/bugs/132055
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