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The error in the log is:
Préparation du remplacement de libpam-modules 1.1.1-4ubuntu1 (en utilisant
.../libpam-modules_1.1.1-4ubuntu2_i386.deb) ...
debconf: DbDriver config: /var/cache/debconf/config.dat is locked by
--
package libpam-modules 1.1.1-4ubuntu1 failed to install/upgrade: le
sous-processus nouveau script pre-installation a retourné une erreur de sortie
d'état 1
https://bugs.launchpad.net/bugs/682857
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