[Bug 1811203] Re: upgrade from Ubuntu 16.04 to 18.04 failed

[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/1811203

Title:
  upgrade from Ubuntu 16.04 to 18.04 failed

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

Bug description:
  The upload GUI said a new version was available and would I like to
  upgrade. I clicked yes and it went off and tried to do its thing but
  failed with:

  "Could not determine 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."

  So I ran the requested command and ended up here...

  Now I do have some third party channels in /etc/apt/sources.list.d
  but there is no information in the GUI telling me what went wrong.

  I tried upgrading from the command line with:

  sudo apt-get upgrade
  sudo apt-get dist-upgrade

  Both of these seem to think I am already up to date.

  "0 to upgrade, 0 to newly install, 0 to remove and 0 not to upgrade."

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.4.0-141.167-generic 4.4.162
  Uname: Linux 4.4.0-141-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME-Classic:GNOME
  Date: Thu Jan 10 07:34:04 2019
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-01-10 (0 days ago)
  VarLogDistupgradeTermlog:

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