[Bug 1871628] Re: update-manager crashed with TypeError in update(): argument of type 'NoneType' is not iterable

[Marcus Tomlinson]

*** This bug is a duplicate of bug 1871490 ***
    https://bugs.launchpad.net/bugs/1871490

** Information type changed from Private to Public

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https://bugs.launchpad.net/bugs/1871628

Title:
  update-manager crashed with TypeError in update(): argument of type
  'NoneType' is not iterable

Status in update-manager package in Ubuntu:
  New

Bug description:
  Trying to upgrade with a poor quality connection.

  ProblemType: Crash
  DistroRelease: Ubuntu 20.04
  Package: update-manager 1:20.04.4
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu25
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr  8 14:52:29 2020
  ExecutablePath: /usr/bin/update-manager
  ExecutableTimestamp: 1586265970
  InstallationDate: Installed on 2019-02-21 (412 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  InterpreterPath: /usr/bin/python3.8
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 /usr/bin/update-manager --no-update --no-focus-on-map
  ProcCwd: /home/nicolas
  ProcEnviron:
   PATH=(custom, user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
  PythonArgs: ['/usr/bin/update-manager', '--no-update', '--no-focus-on-map']
  PythonDetails: /usr/bin/python3.8, Python 3.8.2, unpackaged
  SourcePackage: update-manager
  Title: update-manager crashed with TypeError in update(): argument of type 'NoneType' is not iterable
  UpgradeStatus: Upgraded to focal on 2020-03-20 (19 days ago)
  UserGroups: adm cdrom dialout dip docker lpadmin plugdev sambashare sudo

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