[Bug 1899212] Re: Upgrade from Ubuntu 18.04.5 LTS to Ubuntu 20.04.1 LTS failed - unresolvable problem

[Brian Murray]

*** This bug is a duplicate of bug 1898152 ***
    https://bugs.launchpad.net/bugs/1898152

Thank you for taking the time to report this bug and helping to make
Ubuntu better. This particular bug has already been reported and is a
duplicate of bug 1898152, so it is being marked as such. Please look at
the other bug report to see if there is any missing information that you
can provide, or to see if there is a workaround for the bug.
Additionally, any further discussion regarding the bug should occur in
the other report.  Please continue to report any other bugs you may
find.

** This bug has been marked a duplicate of bug 1898152
   upgrade fails to calculate if gnuradio-dev is installed

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https://bugs.launchpad.net/bugs/1899212

Title:
  Upgrade from Ubuntu 18.04.5 LTS  to Ubuntu 20.04.1 LTS failed -
  unresolvable problem

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

Bug description:
  I used the default GUI software updater which suggested me to update
  to Ubuntu 20. Then the following error was shown:

  ---
  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'.
  ---

  The following command did not produce any output:
  sudo grep -i ppa.launchpad.net /etc/apt/sources.list.d/*.list

  I read the logs in '/var/log/dist-upgrade' but couldn't find anything
  useful.

  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
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Oct  9 22:26:24 2020
  InstallationDate: Installed on 2020-02-23 (229 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 2020-10-09 (0 days ago)
  VarLogDistupgradeTermlog:

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