Ok, it seems to be a known bug. When trying to reinstall samba-libs, the log
states :
secrets.tdb exists in /var/lib/samba and /var/lib/samba/private, aborting
samba-libs preinst
rename one of them to allow the install/upgrade to continue
http://bugs.debian.org/726472
Renaming the file and reins
I must say it looks a lot like the bugs reported in these questions :
http://askubuntu.com/questions/449325/failed-upgrade-of-l-xubuntu-13-10-to-14-04
and
http://ubuntuforums.org/showthread.php?t=2219927
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Public bug reported:
Encountered an issue while updating from 13.10 to 14.04 : the upgrade
encountered an error, stated the system could be unusable. Every time I
tried to use sudo afterwards, it resulted in a "segmentation fault (core
dumped" error.
I removed samba (and a lot of other, important
