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

[Chris Guiver]

Mirrors are free to drop a release anytime AFTER the release reaches
EOL.

The month is known (ie. 19.10 meant the 2019-October release, so it'll
be 9 months after release date), though the EOL may not occur 9 months
to the day, but between that date & end-of-the-month.

19.10 reached EOL, and was announced -
https://fridge.ubuntu.com/2020/07/17/ubuntu-19-10-eoan-ermine-end-of-
life-reached-on-july-17-2020/

meaning mirrors can drop the release the following day if they like, or
any date after that.  The main archive will also occur, as listed AFTER
the release reaches EOL (ie. moved from archive.ubuntu.com to old-
releases.ubuntu.com). There is no set date, except it occurs AFTER eol.

19.10 reached EOL long ago, the release name (19.10) makes the EOL easy
to calculate, making it easy to schedule & plan when you need to
release-upgrade (6-9 months after 2019-October), so your wasted time I'd
see more as a management issue (lack of planning).

3rd party packages can use versioning tricks (higher values put on
packages than what is actually enclosed) to ensure they install &
replace official repositories, but this creates problems come release-
upgrade time; thus the removal step (ppa-purge etc).  (I'm assuming the
camera package is 3rd party, but you gave no specifics)

Either way, unless problems exist in a currently supported upgrade path
(eg. 20.04 release-upgrading to 20.10), eoan being EOL shouldn't have
had any users for months now.

Note: this is my opinion (based on my Ubuntu knowledge).


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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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