[Bug 1897730] Re: Upgrade from 18.04 to 20.04 fails

[Brian Murray]

*** This bug is a duplicate of bug 1887544 ***
    https://bugs.launchpad.net/bugs/1887544

** This bug has been marked a duplicate of bug 1887544
   upgrade from 18.04 to 20.04 fails to calculate if python-pyqt5-dbg is installed

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https://bugs.launchpad.net/bugs/1897730

Title:
  Upgrade from 18.04 to 20.04 fails

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

Bug description:
  ubuntu-release-upgrader can't upgrade my system from bionic to focal
  because of "held" packages, apt-mark showhold shows nothing.

  I started upgrade process from update-manager (launched from gnome
  menu, without '-d' option), but got error:

  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 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
  Uname: Linux 5.4.0-48-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Sep 29 14:59:03 2020
  InstallationDate: Installed on 2018-12-03 (665 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=ru_RU.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-29 (0 days ago)
  VarLogDistupgradeTermlog:

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