Outstanding security updates
Most security updates should be automagically applied overnight by unattended-upgrades and our Nagios check accounts for that by delaying alerts for up to 24hrs.
To see which packages are outstading you can use the apt.security_updates Fabric task.
Before running an unattended upgrade manually it’s worth checking why it
failed to run. Logs of the previous runs can be found in
/var/log/unattended-upgrades. The most recent run log can be found at
unattended-upgrades.log, whereas older logs can be found tarballed by
date in the same directory.
Perform an unattended upgrade manually with the apt.unattended_upgrade Fabric task.
It has been known to alert about packages that were not currently
installed and thus not picked up by unattended-upgrades, such as
dh-apparmor. Such examples of new packages can be
taken care of by manually installing them with
You should only consider running
apt-get dist-upgrade as a last
resort, because it will aggressively upgrade and even downgrade packages
as it deems necessary. Run it with
--dry-run in Integration first and
review the output very carefully. If in doubt ask someone in the
You may see an alert telling you that a connection to NRPE could not be established. See Nagios NRPE connection failures for more information.
'Problem with MergeList’ error
apt-get is known to fail occasionally on machines running Ubuntu
Trusty with an error similar to:
Exception: invalid literal for int() with base 10: 'E: Error: Opening the cache (E:Encountered a section with no Package: header, E:Problem with MergeList /var/lib/apt/lists/mirrors.ubuntu.com_mirrors.txt_dists_trusty_restricted_i18n_Translation-en%5fU'
As a temporary work-around, run these commands on the machine to fix:
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sudo rm -r /var/lib/apt/lists/* sudo apt-get update