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
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