[Bug 2012792] Re: Cannot upgrade

[Tom Reynolds]

The message is correct, you have non Ubuntu packages or package versions
installed, which are likely causing conflicts.

Quote from attached file VarLogDistupgradeMainlog.txt:

Foreign: libignition-cmake2-dev libignition-math6 libignition-math6-dev
nodejs python3-bloom python3-catkin-pkg python3-catkin-pkg-modules
python3-colcon-argcomplete python3-colcon-bash python3-colcon-cd
python3-colcon-cmake python3-colcon-common-extensions python3-colcon-
core python3-colcon-defaults python3-colcon-devtools python3-colcon-
installed-package-information python3-colcon-library-path
python3-colcon-metadata python3-colcon-notification python3-colcon-
output python3-colcon-override-check python3-colcon-package-information
python3-colcon-package-selection python3-colcon-parallel-executor
python3-colcon-pkg-config python3-colcon-powershell python3-colcon-
python-setup-py python3-colcon-recursive-crawl python3-colcon-ros
python3-colcon-test-result python3-colcon-zsh python3-rosdep
python3-rosdep-modules python3-rosdistro python3-rosdistro-modules
python3-rospkg python3-rospkg-modules python3-vcstool ros-build-
essential ros-dev-tools rti-connext-dds-6.0.1

To upgrade Ubuntu, please first ensure you have a clean installation
with only supported packages installed.

Support is available in two forms:
* commercial: https://ubuntu.com/support
* community: https://ubuntu.com/community/support

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/2012792

Title:
  Cannot upgrade

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

Bug description:
  An unresolvable problem occurred while calculating the upgrade.

   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.

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want
  to investigate this yourself the log files in '/var/log/dist-upgrade'
  will contain details about the upgrade. Specifically, look at
  'main.log' and 'apt.log'.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.41
  ProcVersionSignature: Ubuntu 5.15.0-67.74~20.04.1-generic 5.15.85
  Uname: Linux 5.15.0-67-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.25
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Sat Mar 25 21:10:20 2023
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2023-03-25 (0 days ago)
  VarLogDistupgradeTermlog:

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