[Bug 1898647] Re: deleted the ppa, yet can't upgrade

[Chris Guiver]

I note you're using LXDE as your desktop, and your system includes
`lubuntu-desktop`.

Lubuntu 18.04 LTS was the last Lubuntu release that used LXDE, and the
Lubuntu team provide the following note in their release notes

https://lubuntu.me/focal-1-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."

Even if the upgrade completes successfully, you still may not have a
stable/reliable desktop experience, and thus why a fresh install is the
recommend way to upgrade.

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https://bugs.launchpad.net/bugs/1898647

Title:
  deleted the ppa, yet can't upgrade

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

Bug description:
  I keep getting unresolveable error.  Can not figure out how to fix to
  move to the next stage.  Initially it was ppa - but using ppa-purge,
  none could be found.  Then manually removed all references in
  /etc/apt/ folder, still no resolution.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-48.52~18.04.1-generic 5.4.60
  Uname: Linux 5.4.0-48-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: LXDE
  Date: Mon Oct  5 22:03:00 2020
  InstallationDate: Installed on 2019-08-06 (426 days ago)
  InstallationMedia: Lubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-06 (0 days ago)
  VarLogDistupgradeTermlog:

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