Thanks a lot, downgrading of the mentionned packages made the upgrade of
the system possible.
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https://bugs.launchpad.net/bugs/1310983
Title:
Ubuntu upgrade from 13.10 to 14.04 fails -
Thanks for your report.
The version of libnih on your system are not from an official Ubuntu repository:
libnih-dbus1 1.0.3-4.2+0~2013090959.svn2.1 0
libnih1 1.0.3-4.2+0~2013090959.svn2.1 0
and are preventing the upgrade of several core packages (unity, upstart,
systemd)
Please revert