[Bug 1891459] Re: "An unresolvable problem occurred while calculating the upgrade." while upgrading from 18.04 to 20.04.1

[Launchpad Bug Tracker]

*** This bug is a duplicate of bug 1889250 ***
    https://bugs.launchpad.net/bugs/1889250

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1891459

Title:
  "An unresolvable problem occurred while calculating the upgrade."
  while upgrading from 18.04 to 20.04.1

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

Bug description:
  
  Trying to upgrade from 18.04 to 20.04.1, I get the message:
  "
  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'. 
  "

  I used the ubuntu-bug tool to report this, I hope all the needed files are attached :)
  Thanks

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-112.113-generic 4.15.18
  Uname: Linux 4.15.0-112-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.16
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Aug 13 11:27:24 2020
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-08-13 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-08-13T10:50:11.930876

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