Mise à niveau sans surveillance renvoyée: False

Je reçois ce courrier électronique de plusieurs ordinateurs de notre réseau. Une idée de ce que je dois faire?

Unattended upgrade returned: False

Packages that attempted to upgrade:
 firefox firefox-locale-en flashplugin-installer 
 gir1.2-panelapplet-4.0 gnome-calculator gnome-panel gnome-panel-data 
 gnome-session-flashback libgweather-3-6 libgweather-common 
 liboxideqt-qmlplugin liboxideqtcore0 libpanel-applet-4-0 
 oxideqt-codecs-extra python-cupshelpers python-requests 
 python3-requests system-config-printer-common 
 system-config-printer-gnome system-config-printer-udev wpasupplicant 

Unattended-upgrades log:
Initial blacklisted packages: 
Starting unattended upgrades script
Allowed origins are: ['origin=Canonical,suite=trusty', 'origin=Ubuntu,suite=trusty-security', 'origin=Ubuntu,suite=trusty-updates']
Packages that are auto removed: ''
Packages that will be upgraded: firefox firefox-locale-en flashplugin-installer gir1.2-panelapplet-4.0 gnome-calculator gnome-panel gnome-panel-data gnome-session-flashback libgweather-3-6 libgweather-common liboxideqt-qmlplugin liboxideqtcore0 libpanel-applet-4-0 oxideqt-codecs-extra python-cupshelpers python-requests python3-requests system-config-printer-common system-config-printer-gnome system-config-printer-udev wpasupplicant
Writing dpkg log to '/var/log/unattended-upgrades/unattended-upgrades-dpkg_2014-10-15_10:56:47.744158.log'
Internal error while building a minimal partition.Cache has not allowed changes

Et voici le contenu du fichier journal:

(Reading database ... 357633 files and directories currently installed.)
Preparing to unpack .../rsyslog_7.4.4-1ubuntu2.3_amd64.deb ...
Unpacking rsyslog (7.4.4-1ubuntu2.3) over (7.4.4-1ubuntu2.1) ...
Processing triggers for man-db (2.6.7.1-1ubuntu1) ...
Processing triggers for ureadahead (0.100.0-16) ...
ureadahead will be reprofiled on next reboot
Setting up rsyslog (7.4.4-1ubuntu2.3) ...
The user `syslog' is already a member of `adm'.
Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
rsyslog stop/waiting
rsyslog start/running, process 6982

Si cela compte:

#uname -a
Linux xxxxx 3.13.0-37-generic #64-Ubuntu SMP Mon Sep 22 21:28:38 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

Le message d'erreur était trompeur. Le problème était que la apt-get upgradecommande voulait afficher certains journaux des modifications, et comme il s'agissait d'une mise à niveau automatique, il n'y avait ni ttyutilisateur, ni utilisateur pour accepter les modifications, d'où l'origine de cette erreur / courrier électronique.

Un interactif sudo apt-get upgradeet en acceptant les changements résolus le problème.