Could you please run (in a terminal):
$ grep 'Do not remove the following line' /var/lib/dpkg/info/*
update-manager itself does not touch this file, but something in the packages
upgraded might.
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
--
upgrade to karmic trashed /etc/hosts
https://bugs.launchpad.net/bugs/432892
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