[Bug 1895574] Re: Cannot upgrade to Ubuntu 20.04 despite purging unofficial Launchapd PPAs

[Brian Murray]

*** This bug is a duplicate of bug 1611737 ***
    https://bugs.launchpad.net/bugs/1611737

** This bug has been marked a duplicate of bug 1611737
   Can't upgrade from a release if ros packages are  installed from ROS servers

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https://bugs.launchpad.net/bugs/1895574

Title:
  Cannot upgrade to Ubuntu 20.04 despite purging unofficial Launchapd
  PPAs

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

Bug description:
  I tried to upgrade from Ubuntu 18.04 to 20.04 but got the 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. 

  I removed two PPAs using ppa-purge and tried again but I am getting
  the same error.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 5.4.0-47.51~18.04.1-generic 5.4.55
  Uname: Linux 5.4.0-47-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Sep 14 18:16:30 2020
  InstallationDate: Installed on 2019-07-25 (416 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-09-14 (0 days ago)
  VarLogDistupgradeAptclonesystemstate.tar.gz:
   Error: command ['pkexec', 'cat', '/var/log/dist-upgrade/apt-clone_system_state.tar.gz'] failed with exit code 127: The value for the SHELL variable was not found the /etc/shells file
   
   This incident has been reported.
  mtime.conffile..etc.update-manager.release-upgrades: 2020-06-25T17:43:20.862470

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