[Bug 1914841] [NEW] Upgrade to 20.4 fails with unofficial package error

[Jesus Gomez]

Public bug reported:

The application throws this error and some indications: "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." But by looking at the
main.log and apt.log there's no clue about what is causing this issue.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.42
ProcVersionSignature: Ubuntu 5.4.0-65.73~18.04.1-generic 5.4.78
Uname: Linux 5.4.0-65-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
Date: Fri Feb  5 21:32:15 2021
InstallationDate: Installed on 2020-04-14 (297 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-02-06 (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/1914841

Title:
  Upgrade to 20.4 fails with unofficial package error

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

Bug description:
  The application throws this error and some indications: "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." But
  by looking at the main.log and apt.log there's no clue about what is
  causing this issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 5.4.0-65.73~18.04.1-generic 5.4.78
  Uname: Linux 5.4.0-65-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  Date: Fri Feb  5 21:32:15 2021
  InstallationDate: Installed on 2020-04-14 (297 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-02-06 (0 days ago)
  VarLogDistupgradeTermlog:

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