[Bug 1825564] Re: Can’t upgrade from 14.04 to 16.04

[Brian Murray]

You'll want to use the tool ppa-purge from the package ppa-purge to
remove the PPAs you have enabled and revert back to the official
versions of the package which the PPAs provide. Here's an example from
the man page.

        sudo ppa-purge -o sarvatt -p xorg-testing
        will remove https://launchpad.net/~sarvatt/+archive/xorg-testing

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

** Summary changed:

- Can’t upgrade from 14.04 to 16.04
+ Can’t upgrade from 14.04 to 16.04 with PPAs enabled

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https://bugs.launchpad.net/bugs/1825564

Title:
  Can’t upgrade from 14.04 to 16.04 with PPAs enabled

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

Bug description:
  Follow-up from Bug #1824680

  I am unable to start the upgrade process from 14.04 to 16.04.

  "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."

  I have never used a pre-release of Ubuntu but I may have installed
  packages not provided by Ubuntu. I've got some PPAs activated, mainly
  to get a more recent version of Ardour and Jack.

  How can I resolve this problem and upgrade to the next release? Is
  there a way around installing from scratch?

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.10
  ProcVersionSignature: Ubuntu 3.13.0-168.218-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-168-generic i686
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.29
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Fri Apr 19 20:42:24 2019
  InstallationDate: Installed on 2012-05-19 (2526 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2019-04-15 (3 days ago)
  VarLogDistupgradeTermlog:

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