[Bug 1897890] Re: Upgrade fails on python-is-python2 calculation step

[Branimir Lambov]

`sudo /usr/lib/update-notifier/update-motd-updates-available` completes
with no message, after the first time software update found a sensors
package (which may be just a coincidence) but upgrade failed in the same
way, with almost identical logs.

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https://bugs.launchpad.net/bugs/1897890

Title:
  Upgrade fails on python-is-python2 calculation step

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  Appears different from #1875523 as I manually uninstalled both python-
  gi and python-pyside.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Sep 30 14:35:22 2020
  InstallationDate: Installed on 2016-01-28 (1707 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-30 (0 days ago)
  VarLogDistupgradeAptlog: Log time: 2020-09-30 14:32:20.091574

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