[Bug 1914827] Re: 18.04 to 20.04 upgrade failed until -dbg packages removed

[Brian Murray]

** Tags removed: rls-ff-incoming

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https://bugs.launchpad.net/bugs/1914827

Title:
  18.04 to 20.04 upgrade failed until -dbg packages removed

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader source package in Focal:
  New

Bug description:
  I've uploaded the logs. Based on the printout

  "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'."

  I am filing this. Note that the message seems to expect to be able to
  list some reasons for the failure but doesn't have any. In an earlier
  run, it asked me to run ppa-purge, after which the message change to
  give no suggested causes. (I do suspect that I missed something at
  that step since there are 206 broken packages in the apt.log file
  still. Maybe I accidentally removed some ppas rather than doing ppa-
  purge? I am unable to tell from the apt.log file which if any of the
  Broken packages is blocking the upgrade.)

  In main.log, it just says "ERROR Dist-upgrade failed: 'E:Error,
  pkgProblemResolver::Resolve generated breaks, this may be caused by
  held packages.'" I checked, and there are no held packages.

  Really struggling to find a lead to resolve this.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-135.139-generic 4.15.18
  Uname: Linux 4.15.0-135-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Feb  5 13:35:06 2021
  InstallationDate: Installed on 2019-08-13 (541 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-02-05 (0 days ago)

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