[Bug 1901551] Re: I have tried several times to install the updtae evrsion from 18.04 to 20.04. Each time, I have the same answer : There was an unsolvable problem during the upgrade calculation. This was probably caused by: * unofficial software packages that are not from Ubuntu. Please use the "ppa-purge" command from the package "Ppa-purge" to remove packets from a PPA Launchpad repository, and then try to rerun the upgrade.

[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: New => Invalid

** Tags added: ppa sane-ppa

** This bug has been marked a duplicate of bug 1899000
   Upgrade 18.04 --> 20.04 fails

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https://bugs.launchpad.net/bugs/1901551

Title:
  I have tried several times to install the updtae evrsion from 18.04 to
  20.04. Each time, I have the same answer : There was an unsolvable
  problem during the upgrade calculation.    This was probably caused
  by:   * unofficial software packages that are not from Ubuntu. Please
  use the "ppa-purge" command from the package "Ppa-purge" to remove
  packets from a PPA Launchpad repository, and then try to rerun the
  upgrade.

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

Bug description:
  There was an unsolvable problem during the upgrade calculation.

    This was probably caused by:
    * unofficial software packages that are not from Ubuntu.
  Please use the "ppa-purge" command from the package
  "Ppa-purge" to remove packets from a
  PPA Launchpad repository, and then try to rerun the upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  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: XFCE
  Date: Mon Oct 26 15:18:28 2020
  InstallationDate: Installed on 2019-12-23 (307 days ago)
  InstallationMedia: Xubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-26 (0 days ago)
  VarLogDistupgradeTermlog:

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