[Bug 1928734] Re: Upgrade from 18.04 to 20.04 failed

[Brian Murray]

Thanks for taking the time to report this upgrade failure. There is
currently a new version of the release upgrader available in -proposed
which may resolve the error you've encountered. Please run the following
command to test the new version of the upgrader:

  do-release-upgrade -p

Please lets us know the results in this bug report. Thanks again and
good luck!

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

** Tags added: lp-1928397

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https://bugs.launchpad.net/bugs/1928734

Title:
  Upgrade from 18.04 to 20.04 failed

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

Bug description:
  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'.

  From main.log ...
  2021-05-17 16:31:04,840 INFO checking for python-dbg (auto_inst=False)
  2021-05-17 16:31:04,840 INFO checking for python-doc (auto_inst=False)
  2021-05-17 16:31:04,840 INFO checking for python-minimal (auto_inst=False)
  2021-05-17 16:31:04,840 INFO installing python-is-python2 because python-minimal was installed
  2021-05-17 16:31:04,840 DEBUG Installing 'python-is-python2' (python-minimal was installed on the system)
  2021-05-17 16:31:04,900 INFO removing python-minimal because python-is-python2 is being installed
  2021-05-17 16:31:04,900 DEBUG Removing 'python-minimal' (python-is-python2 is being installed on the system)
  2021-05-17 16:31:04,956 INFO failed to remove python-minimal
  2021-05-17 16:31:04,957 INFO checking for python-dev (auto_inst=False)
  2021-05-17 16:31:04,957 INFO checking for libpython-dev (auto_inst=False)
  2021-05-17 16:31:04,957 INFO checking for libpython-stdlib (auto_inst=False)
  2021-05-17 16:31:04,957 INFO removing libpython-stdlib because None is being installed
  2021-05-17 16:31:04,957 DEBUG Removing 'libpython-stdlib' (None is being installed on the system)
  2021-05-17 16:31:05,013 INFO failed to remove libpython-stdlib
  2021-05-17 16:31:05,013 INFO checking for libpython-dbg (auto_inst=False)
  2021-05-17 16:31:05,013 INFO checking for python-dbg (auto_inst=True)
  2021-05-17 16:31:05,013 INFO checking for python-doc (auto_inst=True)
  2021-05-17 16:31:05,013 INFO checking for python-minimal (auto_inst=True)
  2021-05-17 16:31:05,013 INFO installing python-is-python2 because python-minimal was installed
  2021-05-17 16:31:05,014 DEBUG Installing 'python-is-python2' (python-minimal was installed on the system)
  2021-05-17 16:31:05,073 INFO removing python-minimal because python-is-python2 is being installed
  2021-05-17 16:31:05,073 DEBUG Removing 'python-minimal' (python-is-python2 is being installed on the system)
  2021-05-17 16:31:05,073 INFO failed to remove python-minimal
  2021-05-17 16:31:05,073 INFO checking for python-dev (auto_inst=True)
  2021-05-17 16:31:05,073 INFO checking for libpython-dev (auto_inst=True)
  2021-05-17 16:31:05,073 INFO checking for libpython-stdlib (auto_inst=True)
  2021-05-17 16:31:05,073 INFO removing libpython-stdlib because None is being installed
  2021-05-17 16:31:05,073 DEBUG Removing 'libpython-stdlib' (None is being installed on the system)
  2021-05-17 16:31:05,074 INFO failed to remove libpython-stdlib
  2021-05-17 16:31:05,074 INFO checking for libpython-dbg (auto_inst=True)
  2021-05-17 16:37:47,739 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'
  2021-05-17 16:37:47,745 DEBUG abort called
  2021-05-17 16:37:47,748 DEBUG openCache()
  2021-05-17 16:37:51,388 DEBUG Comparing 3.11.0-26 with
  2021-05-17 16:37:51,389 DEBUG Comparing 3.13.0-109 with 3.11.0-26
  2021-05-17 16:37:51,389 DEBUG Comparing 3.13.0-165 with 3.13.0-109
  2021-05-17 16:37:51,390 DEBUG Comparing 3.13.0-96 with 3.13.0-165
  2021-05-17 16:37:51,390 DEBUG Comparing 3.8.0-32 with 3.13.0-165
  2021-05-17 16:37:51,396 DEBUG Comparing 4.15.0-142 with 3.13.0-165
  2021-05-17 16:37:51,396 DEBUG Comparing 4.15.0-143 with 4.15.0-142
  2021-05-17 16:37:51,845 DEBUG /openCache(), new cache size 104343

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 4.15.0-143.147-generic 4.15.18
  Uname: Linux 4.15.0-143-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon May 17 17:04:14 2021
  InstallationDate: Installed on 2013-05-10 (2929 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
   PATH=(custom, no user)
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-05-18 (0 days ago)
  VarLogDistupgradeTermlog:

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