[Bug 1907920] Re: An unresolvable problem occurred while calculating the upgrade

[Teunis Peters]

I'll put it in friendlier form:
- apt should have a notice
- dpkg-upgrade should function.

Those are the issues.
Breaking down why dpkg-upgrade failed meant randomly (or not quite randomly, I did read the log files for hints) removing system components until it functioned.  As python is used for rather a lot, there was a risk of everything apt related failing at any point, and there was no direction to how to solve.
The process also removed a bunch of tools I use daily claiming "obsolete", but those could be reinstalled after.  (as they are standard packages, not third party or outside repositories)

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https://bugs.launchpad.net/bugs/1907920

Title:
  An unresolvable problem occurred while calculating the upgrade

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

Bug description:
  This advice is bad.  Because this release just got purged from sites,
  this is no longer possible to do:

  * 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.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: ubuntu-release-upgrader-core 1:19.10.15.4 [origin: unknown]
  ProcVersionSignature: Ubuntu 5.3.0-64.58-generic 5.3.18
  Uname: Linux 5.3.0-64-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.9
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sat Dec 12 16:15:41 2020
  InstallationDate: Installed on 2018-03-09 (1009 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to eoan on 2020-12-12 (0 days ago)

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