[Bug 1990821] Re: Could not replace ppa repos to upgrade system

[Nick Rosbrook]

It is not enough to disable the sources. Any packages that are installed
from the PPAs also need to be removed. Looking at the attached apt.log,
you should try at least the following:

$ ppa-purge ppa:remmina-ppa-team/remmina-next
$ ppa-purge ppa:pipewire-debian/pipewire-upstream

I don't know where libjbig0 is coming from on your system, but you can
check `apt-cache policy libjbig0`, and try to purge the appropriate PPA.

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https://bugs.launchpad.net/bugs/1990821

Title:
  Could not replace ppa repos to upgrade system

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

Bug description:
  There is an error during system update:
  ```
  This was likely caused by: 
  * 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. 
  ```
  But when I try `sudo ppa-purge ppa:<user_name>/<ppa_name>` it returns  `Warning:  Could not find package list for PPA: <ppa_name>` for all packages and `sudo apt-add-repository --remove ppa:<user_name>/<ppa_name>` 
  doesn't help too

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.39
  ProcVersionSignature: Ubuntu 5.15.0-48.54~20.04.1-generic 5.15.53
  Uname: Linux 5.15.0-48-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.24
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Sep 26 11:43:10 2022
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  InstallationDate: Installed on 2018-08-22 (1496 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 20160624-10:47
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2022-09-26 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-04-21T00:04:03.879343

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