[Bug 1998086] Re: Could not determine the upgrade

[Marc Girod]

*** This bug is a duplicate of bug 1970018 ***
    https://bugs.launchpad.net/bugs/1970018

Same problem again...

Could not determine the upgrade

An unresolvable problem occurred while calculating the upgrade.

 This was likely caused by:
 * 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.

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 did of course run as instructed:
~> sudo ppa-purge ppa:deadsnakes/ppa
Updating packages lists
PPA to be removed: deadsnakes ppa
Warning:  Could not find package list for PPA: deadsnakes ppa
~> sudo apt update
...
~> sudo apt upgrade
...

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https://bugs.launchpad.net/bugs/1998086

Title:
  Could not determine the upgrade

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

Bug description:
  The upgrade failed with the following popup:

  Could not determine the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   This was likely caused by:
   * 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.

  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 don't know/understand what arguments I should give to 'sudo ppa-purge'.
  main.log has DEBUG and INFO messages, ending up with one WARNING.
  apt.log complains about multiple (158) broken packages.
  (15 unique 'Breaks on', 5 'Conflicts on', 71 'Depends on')

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.39
  ProcVersionSignature: Ubuntu 5.4.0-132.148-generic 5.4.212
  Uname: Linux 5.4.0-132-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.24
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Nov 28 08:44:05 2022
  DistributionChannelDescriptor:
   # This is the distribution channel descriptor for the OEM CDs
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-bionic-amd64-20180608-47+italia-whl+X31
  InstallationDate: Installed on 2019-03-13 (1356 days ago)
  InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 20180608-09:38
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2022-11-28 (0 days ago)
  VarLogDistupgradeTermlog:

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