[Bug 1949242] Re: Purged all ppas but cannot do-release-upgrade from Xubuntu 16.04 to 18.04

[Ubuntu Foundations Team Bug Bot]

** Tags added: xenial2bionic

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https://bugs.launchpad.net/bugs/1949242

Title:
  Purged all ppas but cannot do-release-upgrade from Xubuntu 16.04 to
  18.04

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

Bug description:
  Description:	Ubuntu 16.04.7 LTS
  Release:	16.04

  I wanted to upgrade from Xubuntu 16.04 to 18.04. I purged all PPAs.

  Still kept receiving this message when sudo do-release-upgrade:

  ...

  Could not calculate the upgrade

  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'. 

  ...

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.32
  ProcVersionSignature: Ubuntu 4.15.0-24.26~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-24-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.30
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Sat Oct 30 02:04:05 2021
  InstallationDate: Installed on 2016-04-01 (2037 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2021-10-29 (0 days ago)

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