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

[Teunis Peters]

That has a lot of assumptions, the chiefest being that said numbering and naming is public.
This is the first I've heard of it and I've been using ubuntu since somewhere around 7, after switching off of debian.   Most of the third party sources are still back further.
In my case, I'd missed the notice likely because it showed up in the middle of a work deadline and got in the way and was dismissed, likely, then never saw another notice anywhere, so was suprised when everything apt-related stopped working without explanation or warning (404 code is neither), and that none of the related tools said anything other than host unreachable or file unknown.

So my suggestion is to have a warning printed out by apt or dpkg when
running in a terminal about EOL / past EOL.  Would be sufficient.

And then additional repeated surprises as the upgrade tool meant to
solve this kept aborting, crashing and failing - which is where this bug
report came from.

I am posting in the hopes some of the notes help someone else not waste
two days of their life trying to debug this kind of mess, as it did me.
And in the distant hopes someone will prevent this kind of failed
upgrade path from either being known about or failing repeatedly from
happening again.

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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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