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

[flrtx]

I did my best to purge all PPAs. However, I got 'Warning:  Could not
find package list for PPA:' on a couple of them. I tried dist-upgrading
nevertheless and it didn’t work. Any suggestions?

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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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