[Bug 1781446] [NEW] Autopkgtest upgrade-all-security is failing due to apt printing to stderr in Bionic

[Balint Reczey]

Public bug reported:

[Impact] 
 * The following error can be seen in autopkgtest, holding back u-u from migration:
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-bionic/bionic/amd64/u/unattended-upgrades/20180712_151033_c44d8@/log.gz :
...
Processing triggers for libgdk-pixbuf2.0-0:amd64 (2.36.11-2) ...
W: APT had planned for dpkg to do more than it reported back (2370 vs 2372).
   Affected packages: fuse:amd64
Reading package lists...
...
autopkgtest [14:17:33]: test upgrade-all-security:  - - - - - - - - - - results - - - - - - - - - -
upgrade-all-security FAIL stderr: W: APT had planned for dpkg to do more than it reported back (2370 vs 2372).
autopkgtest [14:17:34]: test upgrade-all-security:  - - - - - - - - - - stderr - - - - - - - - - -
W: APT had planned for dpkg to do more than it reported back (2370 vs 2372).
   Affected packages: fuse:amd64
autopkgtest [14:17:34]: test upgrade-between-snapshots: preparing testbed
...

[Test Case]

 * upgrade-all-security autopkgtest

[Regression Potential]

 * Valid errors manifesting themselves only as output from stderr may
not fail the autopkgtest.

** Affects: unattended-upgrades (Ubuntu)
     Importance: High
     Assignee: Balint Reczey (rbalint)
         Status: In Progress

** Changed in: unattended-upgrades (Ubuntu)
       Status: New => In Progress

** Changed in: unattended-upgrades (Ubuntu)
   Importance: Undecided => High

** Changed in: unattended-upgrades (Ubuntu)
     Assignee: (unassigned) => Balint Reczey (rbalint)

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https://bugs.launchpad.net/bugs/1781446

Title:
  Autopkgtest upgrade-all-security is failing due to apt printing to
  stderr in Bionic

Status in unattended-upgrades package in Ubuntu:
  In Progress

Bug description:
  [Impact] 
   * The following error can be seen in autopkgtest, holding back u-u from migration:
  https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-bionic/bionic/amd64/u/unattended-upgrades/20180712_151033_c44d8@/log.gz :
  ...
  Processing triggers for libgdk-pixbuf2.0-0:amd64 (2.36.11-2) ...
  W: APT had planned for dpkg to do more than it reported back (2370 vs 2372).
     Affected packages: fuse:amd64
  Reading package lists...
  ...
  autopkgtest [14:17:33]: test upgrade-all-security:  - - - - - - - - - - results - - - - - - - - - -
  upgrade-all-security FAIL stderr: W: APT had planned for dpkg to do more than it reported back (2370 vs 2372).
  autopkgtest [14:17:34]: test upgrade-all-security:  - - - - - - - - - - stderr - - - - - - - - - -
  W: APT had planned for dpkg to do more than it reported back (2370 vs 2372).
     Affected packages: fuse:amd64
  autopkgtest [14:17:34]: test upgrade-between-snapshots: preparing testbed
  ...

  [Test Case]

   * upgrade-all-security autopkgtest

  [Regression Potential]

   * Valid errors manifesting themselves only as output from stderr may
  not fail the autopkgtest.

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