[Bug 1930648] Re: lubuntu 18.04.5 cannot partially upgrade

[Chris Guiver]

Thank you for taking the time to report this bug and helping to make
Ubuntu better.

Lubuntu 18.04.5 was the last Lubuntu to use the LXDE desktop, and
supported upgrades can only be performed via re-install, ie. release
notes of 18.10 & later contain text like the following (found in
https://lubuntu.me/focal-2-released/)

"Note, due to the extensive changes required for the shift in desktop
environments, the Lubuntu team does not support upgrading from 18.04 or
below to any greater release. Doing so will result in a broken system.
If you are on 18.04 or below and would like to upgrade, please do a
fresh install."

The package `lubuntu-core` doesn't exist in any release past-18.04 as it
was specific to LXDE.  ie.

$ rmadison lubuntu-core
 lubuntu-core | 0.38   | precise/universe        | amd64, armel, armhf, i386, powerpc
 lubuntu-core | 0.55   | trusty/universe         | amd64, armhf, i386, powerpc
 lubuntu-core | 0.65   | xenial/universe         | amd64, armhf, i386, powerpc
 lubuntu-core | 0.65.3 | xenial-updates/universe | amd64, armhf, i386, powerpc
 lubuntu-core | 0.94   | bionic/universe         | amd64, armhf, i386
 lubuntu-core | 0.94.1 | bionic-updates/universe | amd64, armhf, i386

Lubuntu 18.04 LTS was the end-of-the-road for the `lubuntu-core`(LXDE;
https://packages.ubuntu.com/bionic-updates/lubuntu-core) package. It
should have been removed, and your system made a Ubuntu system if you
intended upgrade; as the Lubuntu system requires re-install as per
documentation.

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https://bugs.launchpad.net/bugs/1930648

Title:
  lubuntu 18.04.5 cannot partially upgrade

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

Bug description:
  i was running software upgrade on lubuntu 18.04.5, it was prompted to do partial upgrade which I was select OK. 
  After some times, its said "Can't install 'lubuntu-core': It was impossible to install a required package. Please report this as a bug using 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal".
  Then it asked to close.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.44
  ProcVersionSignature: Ubuntu 5.4.0-73.82-generic 5.4.106
  Uname: Linux 5.4.0-73-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.18
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: LXDE
  Date: Thu Jun  3 09:50:08 2021
  InstallationDate: Installed on 2020-10-01 (244 days ago)
  InstallationMedia: Lubuntu 18.04.5 LTS "Bionic Beaver" - Release amd64 (20200806.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2021-06-03T09:16:02.654719

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