[Bug 1901747]

[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!

** 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/1901747

Title:
  Update from 18.04 to 20.04 not possible

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

Bug description:
  I removed all PPAs with ppa-purge, as well as (hopefully) all packages
  created by myself.

  1) Ubuntu release:
  lsb_release -rd
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  2)Package version
  ubuntu-release-upgrader-core 1:18.04.40

  3) Obviously I expected an upgrade to 20.04

  4) Instead the upgrade process stopped with an error, telling me that the program was not able to determine which system upgrade was available, and that an unsolvable problem occurred - without further informations what the cause of the problem could be.   
  It asks me to file this bug report.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.40
  ProcVersionSignature: Ubuntu 5.4.0-52.57~18.04.1-generic 5.4.65
  Uname: Linux 5.4.0-52-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Oct 27 18:59:02 2020
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-27 (0 days ago)
  VarLogDistupgradeTermlog:

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