[Bug 1787776] Re: Failed to calculate upgrade from 16.04 to 18.04.

[Brian Murray]

Thank you for taking the time to report this bug and helping to make
Ubuntu better. The error that you are a reporting is a package conflict
between a package from the official Ubuntu archive and a package from
the ubuntu-toolchain-r test PPA. To resolve this situation please
uninstall the packages from that PPA using the tool 'ppa-purge' which is
provided by the ppa-purge package. Then try performing the distribution
upgrade operations again. Thanks in advance!

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

** Tags added: ppa-conflict ubuntu-toolchain-r

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https://bugs.launchpad.net/bugs/1787776

Title:
  Failed to calculate upgrade from 16.04 to 18.04.

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

Bug description:
  The system reported it could not calculate the upgrade and closed the upgrade process.
  Displays following message with no extra information:
  "Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

   This can be caused by:
   * Upgrading to a pre-release version of Ubuntu
   * Running the current pre-release version of Ubuntu
   * Unofficial software packages not provided by Ubuntu

  If none of this applies, then please report this bug using the command
  'ubuntu-bug ubuntu-release-upgrader-core' in a terminal."

  No pre-release version is running and all unofficial ppa have been
  removed.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-32.35~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-32-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Aug 18 20:03:27 2018
  InstallationDate: Installed on 2018-01-22 (209 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-19 (0 days ago)
  VarLogDistupgradeTermlog:

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