[Bug 1902759] Re: Could not calculate the upgrade - An unresolvable problem occurred while calculating the upgrade

[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/1902759

Title:
  Could not calculate the upgrade - An unresolvable problem occurred
  while calculating the upgrade

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

Bug description:
  I tried upgrading to 20.04 LTS from 18.04.5 LTS already about a month ago, and it failed, but I thought that the problem occurred because I attempted it too early.
  Well, now that I tried to perform the upgrade again, and it failed again, I think that there is a bigger problem.
  At first, there was an explanation attached to the error message, that the problem was likely caused by "Unofficial software packages not provided by Ubuntu", so I disabled all ppas.
  But I still got the error message "Could not calculate the upgrade", now without any likely causes listed. I disabled all repositories except the main one and the corresponding update and security repositories, but the problem still persists. According to the log file from /var/log/dist-upgrade/apt.log, I have 301 broken packages, but I simply don't understand how that's possible.
  I've reenabled the restricted, universe and multiverse repositories, the number of broken packages stayed the same. do-release-upgrade and update-manager result in the same error. After running sudo apt update && sudo apt upgrade today, the number of broken packages according to the apt.log decreased to 220, but I still can't perform the upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.40
  ProcVersionSignature: Ubuntu 5.4.0-52.57~18.04.1-generic 5.4.65
  Uname: Linux 5.4.0-52-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Nov  3 18:46:49 2020
  InstallationDate: Installed on 2019-10-06 (394 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-11-03 (0 days ago)

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