[Bug 1899065] Re: upgrade from 18.04 to 20.04 fails

[Daniel Letzeisen]

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

https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-
upgrader/+bug/1889250/comments/2

** This bug has been marked a duplicate of bug 1889250
   Unable to calculate the upgrade to 20.04 due to nodejs from nodesource

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https://bugs.launchpad.net/bugs/1899065

Title:
  upgrade from 18.04 to 20.04 fails

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

Bug description:
  Couldn't upgrade from Ubuntu 18.04 to 20.04.
  Error 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 tried to remove PPA packages, but couldn't found any.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
  Uname: Linux 5.4.0-48-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct  8 20:15:32 2020
  InstallationDate: Installed on 2019-09-16 (387 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-08 (0 days ago)
  VarLogDistupgradeTermlog:

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