[Bug 1905075] Re: Can't upgrade to 20

[Brian Murray]

*** This bug is a duplicate of bug 1899000 ***
    https://bugs.launchpad.net/bugs/1899000

Reviewing the files from your upgrade attempt you seem to have enabled a
PPA that provides sane packages. This will prevent the upgrade as that
PPA contains package version numbers greater than the release to which
you are upgrading. You can revert the PPA by installing the ppa-purge
package from the official Ubuntu archive and then running 'sudo ppa-
purge ppa:sane-project/sane-git' or 'sudo ppa-purge ppa:sane-project
/sane-release' .  After that you can try upgrading again and if it still
fails open a new bug report.  Thanks and good luck!

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

** Tags added: ppa sane-ppa

** This bug has been marked a duplicate of bug 1899000
   Upgrade 18.04 --> 20.04 fails if using a PPA providing sane packages

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https://bugs.launchpad.net/bugs/1905075

Title:
  Can't upgrade to 20

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

Bug description:
  Could not calculate the upgrade

  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 1:18.04.40
  ProcVersionSignature: Ubuntu 5.4.0-54.60~18.04.1-generic 5.4.65
  Uname: Linux 5.4.0-54-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Nov 20 10:57:02 2020
  InstallationDate: Installed on 2019-08-02 (475 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-11-20 (0 days ago)
  VarLogDistupgradeTermlog:

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