[Bug 1890989] [NEW] can't upgrade to ubuntu 20.04.1 LTS , says caused by unofficial software packages not provided by ubuntu

[Adhiraj Banerjee]

Public bug reported:

ubuntu release: 
Description:	Ubuntu 18.04.5 LTS
Release:	18.04



Error output: 

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'. 


Restoring original system state

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

main.log :

2020-08-10 11:44:24,081 ERROR Dist-upgrade failed: 'E:Error,
pkgProblemResolversolver::Resolve generated breaks, this may be caused
by held packages.'

2020-08-10 11:44:24,082 DEBUG abort called

purged all rc status files but still unresolved

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.16
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Aug 10 11:49:54 2020
InstallationDate: Installed on 2020-01-04 (219 days ago)
InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-08-10 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2020-08-10T11:20:53.956256

** 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/1890989

Title:
  can't upgrade to ubuntu 20.04.1 LTS , says caused by unofficial
  software packages not provided by ubuntu

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

Bug description:
  ubuntu release: 
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04



  
  Error output: 

  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'. 

  
  Restoring original system state

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

  main.log :

  2020-08-10 11:44:24,081 ERROR Dist-upgrade failed: 'E:Error,
  pkgProblemResolversolver::Resolve generated breaks, this may be caused
  by held packages.'

  2020-08-10 11:44:24,082 DEBUG abort called

  purged all rc status files but still unresolved

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.16
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Aug 10 11:49:54 2020
  InstallationDate: Installed on 2020-01-04 (219 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-08-10 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-08-10T11:20:53.956256

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