The thing is, whenever I run it interactively over ssh, unattended-
upgrade succeeds.  It's only the cron job that fails.

If there's no separate config file, I'll edit /etc/cron.daily/apt
directly.  (This server is still on Ubuntu 14.04 LTS).

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  Unattended upgrade fails with "Error in function"

Status in unattended-upgrades package in Ubuntu:

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

      From: root <>
      Subject: unattended-upgrades result for '': '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 
      Writing dpkg log to 
      Installing the upgrades failed!
      error message: 'installArchives() failed'
      dpkg returned a error! See 
 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
   PATH=(custom, no user)
  SourcePackage: unattended-upgrades
  UpgradeStatus: No upgrade log present (probably fresh install)

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