[Bug 1770965] Re: After upgrade and reboot, the lightdm display manager does not start

[Simon Pepping]

It turns out that the problem is caused by lightdm: When its
configuration points to a not-installed greeter, it fails to load. It is
unfortunate that this bug raises its head upon release upgrade, which
obseletes the kde greeter.

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

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https://bugs.launchpad.net/bugs/1770965

Title:
  After upgrade and reboot, the lightdm display manager does not start

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

Bug description:
  Upon the upgrade, lightdm-kde-greeter was removed as it has become
  obsolete. That leaves the user with a system that hangs.

  I rebooted using system-recovery, and installed lightdm-gtk-greeter
  using aptitude. However, this greeter was not enabled in lightdm.conf.
  Also, the greeter was not configured with the background image for
  this release. I had to do these actions manually. Only then did
  lightdm start properly and with a nice background.

  For most users this problem will leave the system unusable forever,
  and should therefore be avoided. The obsolete greeter should be
  replaced with a suitable greeter.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.17
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Sun May 13 16:30:51 2018
  InstallationDate: Installed on 2013-02-05 (1922 days ago)
  InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: No upgrade log present (probably fresh install)
  VarLogDistupgradeAptlog:
   Log time: 2018-05-13 12:28:57.668250
   Starting pkgProblemResolver with broken count: 0
   Starting 2 pkgProblemResolver with broken count: 0
   Done

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