[Bug 1929374] [NEW] I can't update from ubuntu 18.04 to 20.04

[Juan Carlos Tique Rangel]

Public bug reported:

Despues de actualizar al 18.04 no me deja pasar al 20.04 a travez del
GUI, el error con las instrucciones que me aparecen son:

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'

como se puede leer en las instrucciones trate de usar el software ppa-
purge pero no funciono

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.44
ProcVersionSignature: Ubuntu 4.15.0-143.147-generic 4.15.18
Uname: Linux 4.15.0-143-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity:Unity7:ubuntu
Date: Mon May 24 00:16:37 2021
InstallationDate: Installed on 2021-01-29 (114 days ago)
InstallationMedia: Ubuntu 16.04.7 LTS "Xenial Xerus" - Release amd64 (20200806)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-05-24 (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/1929374

Title:
  I can't update from ubuntu 18.04 to 20.04

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

Bug description:
  Despues de actualizar al 18.04 no me deja pasar al 20.04 a travez del
  GUI, el error con las instrucciones que me aparecen son:

  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'

  como se puede leer en las instrucciones trate de usar el software ppa-
  purge pero no funciono

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 4.15.0-143.147-generic 4.15.18
  Uname: Linux 4.15.0-143-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Mon May 24 00:16:37 2021
  InstallationDate: Installed on 2021-01-29 (114 days ago)
  InstallationMedia: Ubuntu 16.04.7 LTS "Xenial Xerus" - Release amd64 (20200806)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-05-24 (0 days ago)
  VarLogDistupgradeTermlog:

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