[Bug 1842762] Re: cannot upgrade from 16.04 to 18.04

[Chris Guiver]

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

Thank you for taking the time to report this bug and helping to make
Ubuntu better.

The message

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 see evidence of additions that may have come from 3rd party sources
such as https://openschemas.github.io/dockerfiles (if not from there,
they had details about the package which conflicted with the Ubuntu
sourced packages). Sources such as http://packages.ros.org/ros/ubuntu/
are 3rd party and thus fall in the same state as PPA's.


I've marked this as incomplete because unofficial sources are still there. If you believe I am in error, please return this the status to "New" and leave a comment as to why, but currently unofficial packages are still present.


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

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https://bugs.launchpad.net/bugs/1842762

Title:
  cannot upgrade from 16.04 to 18.04

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

Bug description:
  It said that failure to upgrade maybe a result of unofficial ppa
  sources, but I did ppa-purge to remove all possible ppa. Still don't
  work.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.26
  ProcVersionSignature: Ubuntu 4.15.0-60.67~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-60-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.19
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Thu Sep  5 00:23:14 2019
  InstallationDate: Installed on 2017-09-26 (708 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2019-09-04 (0 days ago)
  VarLogDistupgradeTermlog:

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