[Bug 1772246] Re: Lubuntu upgrade to 18.04 fails from 16.04 & 17.10

[Brian Murray]

I tested an upgrade from a fresh and stock install of Lubuntu 16.04 to
Lubuntu 18.04 today and the upgrade was successfully calcluated (while
yours was not). I also tried installed vlc and some gnome packages you
had installed and could not recreate the failure.

I suspect your failure had to do with the xorg packages you had
installed from the oibaf PPA. PPA packages regularly cause issues when
upgrading from one release to another.

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

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https://bugs.launchpad.net/bugs/1772246

Title:
  Lubuntu upgrade to 18.04 fails from 16.04 & 17.10

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

Bug description:
  Originally I was upgrading from 16.04 and switched to 17.10 as an
  "interediate step". Both presumingly fail for the same reason. However
  I only have the log from 17.10 available and post this here.

  do-release-upgrade -d

  --- from dist-upgrade log ---
  …
  2018-05-20 13:10:46,069 DEBUG running doUpdate() (showErrors=True)
  2018-05-20 13:11:09,777 DEBUG openCache()
  2018-05-20 13:11:09,777 DEBUG failed to SystemUnLock() (E:Nicht gesperrt)
  2018-05-20 13:11:10,286 DEBUG /openCache(), new cache size 90600
  2018-05-20 13:11:10,287 DEBUG need_server_mode(): run in 'desktop' mode, (because of key deps for 'lubuntu-core')
  2018-05-20 13:11:11,965 ERROR Dist-upgrade failed: 'E:Fehler: Unterbrechungen durch pkgProblemResolver::Resolve hervorgerufen; dies könnte durch zurückgehaltene Pakete verursacht worden sein.'
  2018-05-20 13:11:11,978 DEBUG abort called
  2018-05-20 13:11:11,983 DEBUG openCache()
  2018-05-20 13:11:11,983 DEBUG failed to SystemUnLock() (E:Nicht gesperrt)
  2018-05-20 13:11:13,666 DEBUG /openCache(), new cache size 88071
  --- log ends here ---

  Hope someone can help and fix it for others as well maybe.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.11
  ProcVersionSignature: Ubuntu 4.13.0-41.46-generic 4.13.16
  Uname: Linux 4.13.0-41-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.8
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sun May 20 13:48:44 2018
  InstallationDate: Installed on 2018-03-06 (75 days ago)
  InstallationMedia: Lubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-05-20 (0 days ago)
  VarLogDistupgradeTermlog:

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