[Bug 1860611] Re: xubuntu - cannot upgrade from 18.04 to 19.04

[Chris Guiver]

Thank you for your report.

Ubuntu 18.04 LTS is intended to upgrade to Ubuntu 18.10
(https://wiki.ubuntu.com/CosmicCuttlefish/ReleaseNotes) or to Ubuntu
20.04 LTS (after 20.04.1's release), ie. the next release or next LTS
release.

If you read Ubuntu 19.04's release notes
(https://wiki.ubuntu.com/DiscoDingo/ReleaseNotes) you'll note only
mention of upgrading from Ubuntu 18.10 as this is all that's supported.

For information on Ubuntu upgrade paths please see
https://help.ubuntu.com/community/UpgradeNotes

Bug reports on an untested and unsupported upgrade path make little
sense, thus I've marked this bug report invalid. If you believe I'm in
error, please change it back to new and give a reason why you believe
it's valid. Thanks again for using Ubuntu.

FYI: Yes it's likely you have non-Ubuntu packages in your system from a
PPA as the error message suggests, but I'm not looking as you're
attempting an unsupported upgrade anyway.  PPA's are 3rd party & should
ideally be removed prior to release-upgrade.

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

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https://bugs.launchpad.net/bugs/1860611

Title:
  xubuntu - cannot upgrade from 18.04 to 19.04

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

Bug description:
  The error message received when trying to upgrade goes as follows:

  
  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 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.36
  ProcVersionSignature: Ubuntu 4.15.0-74.84-generic 4.15.18
  Uname: Linux 4.15.0-74-generic x86_64
  NonfreeKernelModules: talpa_vfshook talpa_pedconnector talpa_pedevice talpa_vcdevice talpa_core talpa_linux talpa_syscallhook
  ApportVersion: 2.20.9-0ubuntu7.9
  Architecture: amd64
  CrashDB: ubuntu
  Date: Wed Jan 22 21:59:00 2020
  InstallationDate: Installed on 2019-07-24 (182 days ago)
  InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-01-22 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update-manager.release-upgrades: 2020-01-11T15:14:53.647131

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