[Bug 1885071] [NEW] Upgrade from 16.04 to 18.04 fails due to ppa

[Christopher Bradley]

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

Public bug reported:

upgrading to 18.04 fails, suggesting I use ppa-purge to remove 3rd party
software.  I have done this for all ppas in my .list. However, the
message persists.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.30
ProcVersionSignature: Ubuntu 4.15.0-106.107~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-106-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Thu Jun 25 00:19:47 2020
InstallationDate: Installed on 2017-09-14 (1014 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2020-06-25 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial xenial2bionic

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https://bugs.launchpad.net/bugs/1885071

Title:
  Upgrade from 16.04 to 18.04 fails due to ppa

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

Bug description:
  upgrading to 18.04 fails, suggesting I use ppa-purge to remove 3rd
  party software.  I have done this for all ppas in my .list. However,
  the message persists.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.30
  ProcVersionSignature: Ubuntu 4.15.0-106.107~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-106-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Jun 25 00:19:47 2020
  InstallationDate: Installed on 2017-09-14 (1014 days ago)
  InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2020-06-25 (0 days ago)

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