[Bug 1909689] [NEW] Upgrade from 18.04 to 20.04 failed

[Markus Suomi]

Public bug reported:

I tried to upgrade from 18.04 to 20.04 per Ubuntu instructions. Upgrade
halted at early stage "Could not calculate the upgrade" with likely
cause said to be unofficial software packages. I tried to remove with
GUI Software & Updates but that did not help. I do not know how to use
ppa-purge tool.

Description:	Ubuntu 18.04.5 LTS
Release:	18.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.41
ProcVersionSignature: Ubuntu 4.15.0-50201905291620.0+mediatree+hauppauge-generic 4.15.18
Uname: Linux 4.15.0-50201905291620-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Wed Dec 30 22:20:35 2020
InstallationDate: Installed on 2018-07-17 (897 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-12-30 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade

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https://bugs.launchpad.net/bugs/1909689

Title:
  Upgrade from 18.04 to 20.04 failed

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

Bug description:
  I tried to upgrade from 18.04 to 20.04 per Ubuntu instructions.
  Upgrade halted at early stage "Could not calculate the upgrade" with
  likely cause said to be unofficial software packages. I tried to
  remove with GUI Software & Updates but that did not help. I do not
  know how to use ppa-purge tool.

  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.41
  ProcVersionSignature: Ubuntu 4.15.0-50201905291620.0+mediatree+hauppauge-generic 4.15.18
  Uname: Linux 4.15.0-50201905291620-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Dec 30 22:20:35 2020
  InstallationDate: Installed on 2018-07-17 (897 days ago)
  InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-12-30 (0 days ago)

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