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

[Teunis Peters]

Blocking packages:
python-gi
openscenegraph (and libraries)
libcamera-info-manager-dev (and dependencies)
libroscpp-dev
libxmlrpcpp-dev
libb64-dev

After that, upgrading was unblocked.
It doesn't make a lot of sense why the above would be a problem, except python-gi maybe as it was python2.7 dependent.
Most have since been reinstalled with newer versions.  Somehow it couldn't detect this path, but there was no issue with installing the upgraded packages back in.

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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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