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

[Marius Gedminas]

This happened again, while trying to upgrade libpq-dev libpq5
postgresql-9.3 postgresql-client-9.3.

Running `unattended-upgrade -v` over an interactive SSH session
succeeded.

I'm not sure what's different.  Locale?  The successful installation log
contains some non-ASCII characters, specifically dpkg's

    (Skaitoma duomenų bazė ... 53857 files and directories currently
installed.)

But if that were the problem, then every upgrade would fail, not just
some of them.  (Besides, if the locale were missing from the cron
environment, dpkg wouldn't be using translations.)

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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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