[Bug 1852451] [NEW] upgrade from 16.04 to 18.04 failed

[Robin B]

Public bug reported:

Ran into an error while trying to upgrade from Ubuntu 16.04 to 18.04:

"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."

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.27
ProcVersionSignature: Ubuntu 4.4.0-168.197-generic 4.4.197
Uname: Linux 4.4.0-168-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.21
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Nov 13 16:27:13 2019
InstallationDate: Installed on 2016-06-13 (1248 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2019-11-13 (0 days ago)
VarLogDistupgradeTermlog:

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial

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https://bugs.launchpad.net/bugs/1852451

Title:
  upgrade from 16.04 to 18.04 failed

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

Bug description:
  Ran into an error while trying to upgrade from Ubuntu 16.04 to 18.04:

  "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."

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.27
  ProcVersionSignature: Ubuntu 4.4.0-168.197-generic 4.4.197
  Uname: Linux 4.4.0-168-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.21
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Wed Nov 13 16:27:13 2019
  InstallationDate: Installed on 2016-06-13 (1248 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-11-13 (0 days ago)
  VarLogDistupgradeTermlog:

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