[Bug 1721294] Re: Unattended upgrade fails with "Error in function"

[Marius Gedminas]

This is a very annoying bug.  Last morning unattended-upgrade failed on
a machine, so I set APT::Periodic::Verbose to "3" and this morning I got
a very verbose email showing that it succeeded.

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Title:
  Unattended upgrade fails with "Error in function"

Status in unattended-upgrades package in Ubuntu:
  Confirmed

Bug description:
  This is the cron email I received today:

      From: root <root at iv-4.pov.lt>
      To: root at pov.lt
      Subject: unattended-upgrades result for 'iv-4.pov.lt': 'False'
      Date: Wed,  4 Oct 2017 03:40:19 +0300 (EEST)

      Unattended upgrade returned: False

      Packages that attempted to upgrade:
       ca-certificates libidn11 libnss3 libnss3-nssdb

      Package installation log:
      Error in function:

  
      Unattended-upgrades log:
      Initial blacklisted packages:
      Starting unattended upgrades script
      Allowed origins are: ['o=Ubuntu,a=trusty-security', 'o=UbuntuESM,a=trusty', 'o=Ubuntu,a=trusty-security', 'o=Ubuntu,a=trusty-updates', 'origin=LP-PPA-pov,suite=trusty']
      Packages that will be upgraded: ca-certificates libidn11 libnss3 libnss3-nssdb
      Writing dpkg log to '/var/log/unattended-upgrades/unattended-upgrades-dpkg_2017-10-04_03:40:17.411277.log'
      Installing the upgrades failed!
      error message: 'installArchives() failed'
      dpkg returned a error! See '/var/log/unattended-upgrades/unattended-upgrades-dpkg_2017-10-04_03:40:17.411277.log' for details
      Packages that are auto removed: ''
      Packages auto-removed

  The named log file, var/log/unattended-upgrades/unattended-upgrades-
  dpkg_2017-10-04_03:40:17.411277.log contains only this:

      Error in function:

  That's it.

  Now given that ca-certificates is involved, I suspect this may be
  related to non-ASCII filenames (see bug 1554365), but unlike that bug,
  here the upgrade fails instead of succeeding, and the actual error is
  not shown anywhere.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unattended-upgrades 0.82.1ubuntu2.5
  Uname: Linux 2.6.32-042stab124.2 x86_64
  ApportVersion: 2.14.1-0ubuntu3.25
  Architecture: amd64
  Date: Wed Oct  4 18:54:54 2017
  PackageArchitecture: all
  ProcEnviron:
   LC_CTYPE=lt_LT.UTF-8
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=lt_LT.UTF-8
   SHELL=/bin/bash
  SourcePackage: unattended-upgrades
  UpgradeStatus: No upgrade log present (probably fresh install)

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