Public bug reported:

On Ubuntu Xenial, apt-get fails silently when security update server
cannot be reached. This state could be detected by scanning the apt-get
output afterwards. But manually adding workarounds to each apt-get
invocation in production automation is prone to error, thus leaving
machines without security updates.

Expected behaviour (e.g.):
* 0 - all OK
* 1 - temporary failure (e.g. network)
* 2 - permanent failure


Test:
* Change your update server IP in /etc/hosts to something unreachable
* Run apt-get update (might take a while)
* Check exit status


$ lsb_release -r -d
Description:    Ubuntu 16.04.3 LTS
Release:        16.04
rfiedler@n3ahit1403:~$ 

ii  apt                                 1.2.24
amd64        commandline package manager

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1742695

Title:
  apt-get update silently fails fetching security updates

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