[Bug 1995794] [NEW] Unable to upgrade from Ubuntu 18.04

[Noé Cornet]

Public bug reported:

I am not able to upgrade from Ubuntu 18.04 LTS to 20.04, although the
upgrade is proposed to me.

I get the error:
    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.

I tried purging some ppas, but I cannot find the faulty one.

(Note that I try the upgrade now because I wanted from a long time to do
a clean-install, but I do not find the time, and now this LTS is out-of-
date.)

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.45
ProcVersionSignature: Ubuntu 5.4.0-131.147~18.04.1-generic 5.4.210
Uname: Linux 5.4.0-131-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.28
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Sun Nov  6 13:38:24 2022
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2022-11-06 (0 days ago)
VarLogDistupgradeTermlog:

** 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/1995794

Title:
  Unable to upgrade from Ubuntu 18.04

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

Bug description:
  I am not able to upgrade from Ubuntu 18.04 LTS to 20.04, although the
  upgrade is proposed to me.

  I get the error:
      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.

  I tried purging some ppas, but I cannot find the faulty one.

  (Note that I try the upgrade now because I wanted from a long time to
  do a clean-install, but I do not find the time, and now this LTS is
  out-of-date.)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.45
  ProcVersionSignature: Ubuntu 5.4.0-131.147~18.04.1-generic 5.4.210
  Uname: Linux 5.4.0-131-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.28
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Sun Nov  6 13:38:24 2022
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2022-11-06 (0 days ago)
  VarLogDistupgradeTermlog:

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