[Bug 2016247] [NEW] Unable to upgrade from 18 to 20: "Unofficial software packages not provided by Ubuntu"

[Joaquín]

Public bug reported:

The output is
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'. 


Restoring original system state

Aborting
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.41
ProcVersionSignature: Ubuntu 5.15.0-69.76~20.04.1-generic 5.15.87
Uname: Linux 5.15.0-69-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.26
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 14 10:15:19 2023
InstallationDate: Installed on 2020-05-28 (1050 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2023-04-14 (0 days ago)
modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2020-05-28T15:58:22.563135

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


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

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https://bugs.launchpad.net/bugs/2016247

Title:
  Unable to upgrade from 18 to 20: "Unofficial software packages not
  provided by Ubuntu"

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

Bug description:
  The output is
  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'. 

  
  Restoring original system state

  Aborting
  Reading package lists... Done    
  Building dependency tree          
  Reading state information... Done

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.41
  ProcVersionSignature: Ubuntu 5.15.0-69.76~20.04.1-generic 5.15.87
  Uname: Linux 5.15.0-69-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.26
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Apr 14 10:15:19 2023
  InstallationDate: Installed on 2020-05-28 (1050 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2023-04-14 (0 days ago)
  modified.conffile..etc.default.apport:
   # set this to 0 to disable apport, or to 1 to enable it
   # you can temporarily override this with
   # sudo service apport start force_start=1
   enabled=0
  mtime.conffile..etc.default.apport: 2020-05-28T15:58:22.563135

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