package samba-libs (not installed) failed to install/upgrade: le sous-processus nouveau script pre-installation a retourné une erreur de sortie d'état 1

[Jean-Baptiste Camps]

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 looking, packages) via synaptic, and now sudo works again.

ProblemType: Package
DistroRelease: Ubuntu 14.04
Package: samba-libs (not installed)
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
Date: Mon Apr 28 15:28:32 2014
DuplicateSignature: package:samba-libs:(not installed):le sous-processus nouveau script pre-installation a retourné une erreur de sortie d'état 1
ErrorMessage: le sous-processus nouveau script pre-installation a retourné une erreur de sortie d'état 1
InstallationDate: Installed on 2013-07-18 (283 days ago)
InstallationMedia: Ubuntu 12.04.2 LTS "Precise Pangolin" - Release amd64 (20130213)
SourcePackage: samba
Title: package samba-libs (not installed) failed to install/upgrade: le sous-processus nouveau script pre-installation a retourné une erreur de sortie d'état 1
UpgradeStatus: Upgraded to trusty on 2014-04-28 (0 days ago)

[Jean-Baptiste Camps (jbcamps)]

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

[Jean-Baptiste Camps (jbcamps)]

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 reinstalling seems to work.