[Bug 1811203] [NEW] upgrade from Ubuntu 16.04 to 18.04 failed

[Bruce Adams]

Public bug reported:

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:

** 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/1811203

Title:
  upgrade from Ubuntu 16.04 to 18.04 failed

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

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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