[Bug 1927204] Re: Upgrade to 20.04 crashes even after disabling all 3rd party software sources

[Chris Guiver]

Thank you for taking the time to report this issue and helping to make
Ubuntu better.

The error message you likely saw says

"* 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."

The ppa-purge tool doesn't just disable sources, but removes the
packages that were installed from those sources. It's the installed
packages that create the problem in upgrade.

I looked and do see evidence of 3rd party (PPA) packages present, so I
suggest support is in order.

I've marked this incomplete, as you haven't followed the PPA purge
instructions and removed all 3rd party software before upgrade to
proceed.   If you believe I'm in error, or have missed something, please
leave a comment explaining why, and you can return the status to "New".

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1927204

Title:
  Upgrade to 20.04 crashes even after disabling all 3rd party software
  sources

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

Bug description:
  I tried to upgrade ubuntu from 18 to 20.04. First it crashed
  complaining that I should purge 3rd party ppa's. After I disabled them
  in the software & update under the other software section it still
  crashes at the same point with an reduced error message as follows:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   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'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 5.4.0-72.80~18.04.1-generic 5.4.101
  Uname: Linux 5.4.0-72-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Wed May  5 11:57:29 2021
  InstallationDate: Installed on 2019-06-19 (685 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-05-05 (0 days ago)
  VarLogDistupgradeTermlog:

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