[Bug 1947986] [NEW] Updating from Ubuntu 18.04 to Ubuntu 20.04 LTS fails

[Hakan Cuzdan]

Public bug reported:

I am a Ubuntu newbie. I got the following error when updating from
Ubuntu 18.04 to latest Ubuntu 20.04 LTS:

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

 This was likely caused by:
 * Unofficial software packages not provided by Ubuntu
Please use the tool 'ppa-purge' from the ppa-purge 
package to remove software from a Launchpad PPA and 
try the upgrade again.

If none of this applies, then please report this bug using the command
'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to
investigate this yourself the log files in '/var/log/dist-upgrade' will
contain details about the upgrade. Specifically, look at 'main.log' and
'apt.log'.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.45
ProcVersionSignature: Ubuntu 5.4.0-89.100~18.04.1-generic 5.4.143
Uname: Linux 5.4.0-89-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.26
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 21 12:03:44 2021
InstallationDate: Installed on 2019-12-25 (665 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-10-21 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages

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https://bugs.launchpad.net/bugs/1947986

Title:
  Updating from Ubuntu 18.04 to Ubuntu 20.04 LTS fails

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

Bug description:
  I am a Ubuntu newbie. I got the following error when updating from
  Ubuntu 18.04 to latest Ubuntu 20.04 LTS:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   This was likely caused by:
   * Unofficial software packages not provided by Ubuntu
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again.

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want
  to investigate this yourself the log files in '/var/log/dist-upgrade'
  will contain details about the upgrade. Specifically, look at
  'main.log' and 'apt.log'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.45
  ProcVersionSignature: Ubuntu 5.4.0-89.100~18.04.1-generic 5.4.143
  Uname: Linux 5.4.0-89-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.26
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 21 12:03:44 2021
  InstallationDate: Installed on 2019-12-25 (665 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-10-21 (0 days ago)
  VarLogDistupgradeTermlog:

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