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

[Bruce Adams]

I've tried disabling the third party packages (via tickboxes in update manager)
and running ppa-purge (though I'm unclear what precisely its supposed to do):

grep ppa /etc/apt/sources.list.d/*
/etc/apt/sources.list.d/morphis-ubuntu-anbox-support-xenial.list:deb http://ppa.launchpad.net/morphis/anbox-support/ubuntu xenial main
/etc/apt/sources.list.d/morphis-ubuntu-anbox-support-xenial.list:# deb-src http://ppa.launchpad.net/morphis/anbox-support/ubuntu xenial main
/etc/apt/sources.list.d/morphis-ubuntu-anbox-support-xenial.list.distUpgrade:deb http://ppa.launchpad.net/morphis/anbox-support/ubuntu xenial main
/etc/apt/sources.list.d/morphis-ubuntu-anbox-support-xenial.list.distUpgrade:# deb-src http://ppa.launchpad.net/morphis/anbox-support/ubuntu xenial main
/etc/apt/sources.list.d/morphis-ubuntu-anbox-support-xenial.list.save:deb http://ppa.launchpad.net/morphis/anbox-support/ubuntu xenial main
/etc/apt/sources.list.d/morphis-ubuntu-anbox-support-xenial.list.save:# deb-src http://ppa.launchpad.net/morphis/anbox-support/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list:deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list:# deb-src http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list.distUpgrade:deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list.distUpgrade:# deb-src http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list.save:deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main
/etc/apt/sources.list.d/ubuntu-toolchain-r-ubuntu-test-xenial.list.save:# deb-src http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu xenial main

sudo ppa-purge ppa:ubuntu-toolchain-r-ubuntu-test-xenial
Updating packages lists
PPA to be removed: ppa:ubuntu-toolchain-r-ubuntu-test-xenial 
ppa:ubuntu-toolchain-r-ubuntu-test-xenial
Warning:  Could not find package list for PPA: 
ppa:ubuntu-toolchain-r-ubuntu-test-xenial 
ppa:ubuntu-toolchain-r-ubuntu-test-xenial
sudo ppa-purge ppa:morphis-ubuntu-anbox-support-xenial
Updating packages lists
PPA to be removed: ppa:morphis-ubuntu-anbox-support-xenial 
ppa:morphis-ubuntu-anbox-support-xenial
Warning:  Could not find package list for PPA: 
ppa:morphis-ubuntu-anbox-support-xenial ppa:morphis-ubuntu-anbox-support-xenial


This makes no difference. Where do I find the actual error?

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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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