[Bug 1297936] Re: After upgrade 12.04->14.04 lightdm fails to start

[Harald Sitter]

I am not sure we can do much about broken config files to be honest.

** Package changed: ubuntu-release-upgrader (Ubuntu) => lightdm (Ubuntu)

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https://bugs.launchpad.net/bugs/1297936

Title:
  After upgrade 12.04->14.04 lightdm fails to start

Status in “lightdm” package in Ubuntu:
  New

Bug description:
  I upgraded this Kubuntu laptop using the command "do-release-upgrade
  -d" from 12.04 to 14.04. After the reboot, the splash screen did not
  disappear and lightdm didn't start. Running the command "start
  lightdm" (as root), I got the error message "start: Job failed to
  start", which wasn't really helpful. I also tried the command
  "/etc/init.d/lightdm start" and now there was some more information:

  [+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
  [+0.00s] DEBUG: Starting Light Display Manager 1.9.13, UID=0 PID=2635
  [+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
  [+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/40-kde-plasma.conf
  [+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/40-lightdm-kde-greeter.conf
  [+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-greeter-wrapper.conf
  [+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-guest-wrapper.conf
  [+0.00s] DEBUG: Loading configuration from /usr/share/lightdm/lightdm.conf.d/50-xserver-command.conf
  [+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
  [+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
  [+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
  [+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
  [+0.00s] DEBUG: Using Xephyr for X servers
  [+0.00s] DEBUG: Registered seat module xlocal
  [+0.00s] DEBUG: Registered seat module xremote
  [+0.00s] DEBUG: Registered seat module unity
  [+0.00s] DEBUG: Registered seat module surfaceflinger
  [+0.01s] DEBUG: Adding default seat
  [+0.01s] DEBUG: Seat: Starting
  [+0.01s] DEBUG: Seat: Creating greeter session
  [+0.01s] DEBUG: Seat: Failed to find session configuration lightdm-gtk-greeter
  [+0.01s] DEBUG: Seat: Failed to create greeter session
   * Starting X display manager lightdm                                                                                                   [ OK ] 

  Even though there was the "[ OK ]" displayed in the last line, lightdm
  didn't start. Due to the message "Failed to find session configuration
  lightdm-gtk-greeter" I supposed that the package lightdm-gtk-greeter
  was missing. And indeed after I installed that package (+
  dependencies), lightdm started.

  As this is a test-upgrade I could return to the original 12.04 system.
  On that partition was a file /etc/lightdm/lightdm.conf from 2012 with
  this contents:

  [SeatDefaults]
  greeter-session=lightdm-gtk-greeter
  user-session=Lubuntu

  Obviously this was a leftover of a previous test with the lubuntu-
  desktop. While I had uninstalled lightdm and most of the other Lubuntu
  packages, this configuration file was not removed for some reason. And
  during the upgrade I was not asked if the config file should be
  replaced but the file stayed untouched.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.219
  ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
  Uname: Linux 3.13.0-19-generic i686
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Wed Mar 26 17:26:05 2014
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2014-03-26 (0 days ago)

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