[Bug 1873689] Re: could not calculate upgrade while upgrading to 18.04

[Brian Murray]

*** This bug is a duplicate of bug 1069133 ***
    https://bugs.launchpad.net/bugs/1069133

** This bug is no longer a duplicate of bug 1873687
   could not calculate upgrade while upgrading to 18.04
** This bug has been marked a duplicate of bug 1069133
   Get upgrade error 12.04 - 12.10 "Could not determine upgrade" - xorg from ppa

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https://bugs.launchpad.net/bugs/1873689

Title:
  could not calculate upgrade while upgrading to 18.04

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

Bug description:
  While trying to upgrade to Ubuntu 18.04, I get this error message:

  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 1:16.04.29
  ProcVersionSignature: Ubuntu 4.4.0-177.207-generic 4.4.214
  Uname: Linux 4.4.0-177-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sun Apr 19 11:29:04 2020
  InstallationDate: Installed on 2018-06-17 (672 days ago)
  InstallationMedia: Ubuntu-Server 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.8)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-04-19 (0 days ago)
  VarLogDistupgradeTermlog:

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