[Bug 1900433] Re: Distribution upgrade fails but does not provide a reason why

[Launchpad Bug Tracker]

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/1900433

Title:
  Distribution upgrade fails but does not provide a reason why

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

Bug description:
  I am trying to upgrade from Ubuntu 18.04.5 LTS to 20.04. I have non-standard software installed (wifi drivers, dropbox, skype), so I was not too surprised to receive the following message:
  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'.

  After looking the issue up online, I found that I needed to disable the non-standard repositories. I did this (using the visual interface rather than ppa-purge). Then I tried the upgrade again. I then received the following message:
  An unresolvable problem occurred while calculating the upgrade.

   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'.

  That is, I received the same message, but this time without the
  information regarding PPAs. Whatever the trouble is, it seems that the
  system does not know how to explain it. Moreover, when I looked at
  'main.log', I did not find any errors.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.40
  ProcVersionSignature: Ubuntu 5.4.0-51.56~18.04.1-generic 5.4.65
  Uname: Linux 5.4.0-51-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Oct 19 06:43:42 2020
  InstallationDate: Installed on 2020-03-19 (213 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-19 (0 days ago)
  VarLogDistupgradeTermlog:

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