[Bug 1891641] Re: package unattended-upgrades 2.3ubuntu0.1 failed to install/upgrade: installed unattended-upgrades package post-installation script subprocess returned error exit status 1

[Julian Andres Klode]

*** This bug is a duplicate of bug 1627564 ***
    https://bugs.launchpad.net/bugs/1627564

** This bug has been marked a duplicate of bug 1627564
   Debconf crash due to assertion failure in ensure_surface_for_gicon [gtkiconhelper.c:493] (when png loader is missing/during upgrades)

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https://bugs.launchpad.net/bugs/1891641

Title:
  package unattended-upgrades 2.3ubuntu0.1 failed to install/upgrade:
  installed unattended-upgrades package post-installation script
  subprocess returned error exit status 1

Status in debconf package in Ubuntu:
  New

Bug description:
  This occured while upgrading from Ubuntu 18.04 to 20.04

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: unattended-upgrades 2.3ubuntu0.1
  ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.6
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Fri Aug 14 16:32:44 2020
  ErrorMessage: installed unattended-upgrades package post-installation script subprocess returned error exit status 1
  InstallationDate: Installed on 2020-08-07 (7 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
  PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4
  RelatedPackageVersions:
   dpkg 1.19.7ubuntu3
   apt  2.0.2ubuntu0.1
  SourcePackage: unattended-upgrades
  Title: package unattended-upgrades 2.3ubuntu0.1 failed to install/upgrade: installed unattended-upgrades package post-installation script subprocess returned error exit status 1
  UpgradeStatus: Upgraded to focal on 2020-08-14 (0 days ago)
  modified.conffile..etc.apt.apt.conf.d.10periodic:
   APT::Periodic::Update-Package-Lists "7";
   APT::Periodic::Download-Upgradeable-Packages "0";
   APT::Periodic::AutocleanInterval "0";
   APT::Periodic::Unattended-Upgrade "0";
  mtime.conffile..etc.apt.apt.conf.d.10periodic: 2020-08-14T15:42:52.692116

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