[Bug 1843688] Re: Trying to upgrade OS to latest LTS after purging PPAs

[Chris Haycock]

Reproduction Steps:

I navigated to the software and updates screen/window
The other software tab
Clicked through my entire list of added repository's and hit remove for each one until none remain
Clicked close and then confirmed I would need to reload sources
The cache was updated
I proceeded to install what updates I had available
Upon completion of the upgrade, the updater tells me there is a new LTS version available, 18.04.2
I click on the upgrade.. button from this prompt
I confirm the release notes screen for Bionic Beaver and click upgrade
Distribution upgrade window appears and begins to work through the list of tasks
The window fades out of focus while at the step of "Setting new software channels 93/100"
I am then presented with a "could not determine the upgrade" stop screen
I accept the stop and the changes are seemingly rolled back

Navigating back to the software and updates screen/window I see that all
my repository's have now been restored.

So this makes me think my removal of the PPA's did not actually work?

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https://bugs.launchpad.net/bugs/1843688

Title:
  Trying to upgrade OS to latest LTS after purging PPAs

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

Bug description:
  System Information:

  Unbuntu 16.04 LTS 64 Bit
  Using apt-cache policy pkgname gives me "N: Unable to locate package pkgname"

  
  Going through the software update option I was informed that the LTS for version 18 of Ubuntu was now available so I went ahead to install this. First time around I was told some of my PPA's could be causing a problem so i purged these and tried again. 

  Expected behavior would be that the upgrade works with minimal user interaction
  What actually happens is that I do not get past the second part of the upgrade and i get the message saying the upgrade could not be completed.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  Uname: Linux 4.4.9-040409-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Sep 12 10:08:52 2019
  InstallationDate: Installed on 2016-06-25 (1173 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-09-12 (0 days ago)
  VarLogDistupgradeTermlog:

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