[Bug 1899710] Re: upgrade to 20.04 interrupted, third-party ppas reappear after being removed

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

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

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https://bugs.launchpad.net/bugs/1899710

Title:
  upgrade to 20.04 interrupted, third-party ppas reappear after being
  removed

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

Bug description:
  I'm attempting to upgrade to 20.04. I've found lots of people with the
  same error

  An unresolvable problem occurred while calculating the upgrade.

  This was likely caused by: 
  * Unofficial software packages not provided by Ubuntu 
  Please use the tool 'ppa-purge' from the ppa-purge 
  package to remove software from a Launchpad PPA and 
  try the upgrade again. 

  If none of this applies, then please report this bug using the 
  command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If 
  you want to investigate this yourself the log files in 
  '/var/log/dist-upgrade' will contain details about the upgrade. 
  Specifically, look at 'main.log' and 'apt.log'. 

  
  The advice seems to be to remove third-party ppas. Nowhere on the internet can I find a reliable method for doing this. I'm missing the most crucial piece of information, how do you even know which ppas are third-party? I've found multiple places where people got the same error, and someone said "This ppa is third-party" but literally zero of them explained how they know that, or how I could figure that out. I guess I'm just supposed to memorize a list or something?

  I have used the Software Update GUI. I go through, remove each PPA.
  They reappear when I close it. They sometimes stay gone, but they are
  restored when the do-release-upgrade command fails.

  I've used ppa-purge. For most of the ppas this just doesn't run. I
  directly write in the URL from sources.list.d, and the computer says
  it doesn't exist. Even for the ones that don't return that error and
  claim to have removed the ppa, there is no evidence that anything
  worked. They are still there when I open the gui. do-release-upgrade
  still doesn't run.

  I found a few places that say I should solve this by removing one
  thing at a time, try to upgrade, each time and eventually it'll run
  once I've removed the right thing, but this obviously cannot work if
  the ppas regenerate.

  Am I barking up the wrong tree? Where do I even start to figure out
  this problem?

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-51.56~18.04.1-generic 5.4.65
  Uname: Linux 5.4.0-51-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Oct 13 18:38:00 2020
  InstallationDate: Installed on 2020-01-08 (279 days ago)
  InstallationMedia: Ubuntu 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-14 (0 days ago)

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