[Bug 1787788] Re: upgrade xenial --> bionic :cannot compute upgrade

[Juhani Numminen]

Hello Mike,

Did you manage to complete the upgrade?

You wrote that you tried to remove any unsupported programs, but were
are still some remaining at the time of the upgrade attempt. The upgrade
tool produced a list of foreign packages and it is attached to this bug:
open the compressed archive https://bugs.launchpad.net/ubuntu/+source
/ubuntu-release-
upgrader/+bug/1787788/+attachment/5177405/+files/VarLogDistupgradeAptclonesystemstate.tar.gz
and inside it, see the file var/lib/apt-clone/foreign.pkgs. You could
try removing those packages and see if the upgrade becomes possible.

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

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https://bugs.launchpad.net/bugs/1787788

Title:
  upgrade xenial --> bionic :cannot compute upgrade

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

Bug description:
  I am unaware of any unsupported packages installed that would prevent the upgrade from working. 
  I removed as many ppa's as possible, removed any unsupported programs which might be a problem, and fixed the parsing error 'Metadata files have errors: /var/cache/app-info/xmls/fwupd.xml'. I'm at a loss at this point.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.25
  ProcVersionSignature: Ubuntu 4.15.0-32.35~16.04.1-generic 4.15.18
  Uname: Linux 4.15.0-32-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Sat Aug 18 22:50:27 2018
  InstallationDate: Installed on 2015-10-26 (1027 days ago)
  InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-08-19 (0 days ago)
  VarLogDistupgradeTermlog:

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