[Bug 1264887] Re: After upgrade 12.04 -> 14.04 there was no display manager (kdm or lightdm)

[Nils Kassube]

Indeed I don't have kubuntu-desktop installed because I removed one (or
more) of it's dependencies a long time ago. I think this is not
uncommon, though. At the end of the upgrade I didn't let upgrade-manager
clean up unused packages, therefore the reason for the removal of kdm
seems to be something else.

For this upgrade test I made a copy of my main system to an extra
partition and therefore I can try the upgrade again to verify if a
possible fix works.

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https://bugs.launchpad.net/bugs/1264887

Title:
  After upgrade 12.04 -> 14.04 there was no display manager (kdm or
  lightdm)

Status in “ubuntu-release-upgrader” package in Ubuntu:
  Confirmed

Bug description:
  This Kubuntu machine had KDM installed before the upgrade from 12.04
  to 14.04. After the upgrade there was no display manager left, i.e.
  kdm was no longer installed and it wasn't replaced by lightdm like it
  happened on another machine with a fresh Kubuntu 12.04 system.

  The upgrade should either keep KDM or replace it by lightdm, but it
  should not leave the system in a state without display manager.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.209
  ProcVersionSignature: Ubuntu 3.12.0-7.15-generic 3.12.4
  Uname: Linux 3.12.0-7-generic x86_64
  ApportVersion: 2.12.7-0ubuntu3
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Sun Dec 29 22:35:03 2013
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2013-12-29 (0 days ago)
  VarLogDistupgradeTermlog:

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