[Bug 1820888] [NEW] unattended-upgrades may hold back upgrades due to comparing package versions by their string representation

[Balint Reczey]

Public bug reported:

This is part of the reason why the autopkgtes installing all security updates is failing for cosmic with 1.10ubuntu1:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-disco/disco/amd64/u/unattended-upgrades/20190318_182031_fe4fe@/log.gz
...
Checking: libnss-systemd ([<Origin component:'main' archive:'cosmic-updates' origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
pkg libsystemd0 not in allowed origin
sanity check failed
...

** Affects: unattended-upgrades (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1820888

Title:
  unattended-upgrades may hold back upgrades due to comparing package
  versions by their string representation

Status in unattended-upgrades package in Ubuntu:
  New

Bug description:
  This is part of the reason why the autopkgtes installing all security updates is failing for cosmic with 1.10ubuntu1:
  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-disco/disco/amd64/u/unattended-upgrades/20190318_182031_fe4fe@/log.gz
  ...
  Checking: libnss-systemd ([<Origin component:'main' archive:'cosmic-updates' origin:'Ubuntu' label:'Ubuntu' site:'archive.ubuntu.com' isTrusted:True>])
  pkg libsystemd0 not in allowed origin
  sanity check failed
  ...

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