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

[Laurin Elis]

Public bug reported:

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)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic dist-upgrade

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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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