Cannot switch users due to missing service file

[Michal Rudolf]

I don't know if this is correct package to associate with the bug, I am just guessing.

The bug:
It is not possible to switch users in Gnome Shell.

How to reproduce:
1. Open top right menu in Gnome Shell and select "Switch user"

Expected behaviour:
Login window shown.

Observed behaviour:
1. Screen gets black for a moment (except top bar)
2. Logged user's screen is displayed again
3. Following error is displayed:
"The name org.gnome.DisplayManager was not provided by any .service files"

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: lightdm 1.1.9-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-21.34-generic-pae 3.2.13
Uname: Linux 3.2.0-21-generic-pae i686
ApportVersion: 2.0-0ubuntu2
Architecture: i386
Date: Sun Apr 1 11:28:40 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
SourcePackage: lightdm
UpgradeStatus: Upgraded to precise on 2012-03-31 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jeremy Bícha (jbicha)]

Thank you for reporting this bug to Ubuntu. Ubuntu 12.04 LTS reached End of Life in April. See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases

Please upgrade to Ubuntu 16.04 LTS and re-test. If the bug is still reproducible, increase the verbosity of the steps to recreate it so we can try again.

I apologize that we are not always to respond to bug reports promptly. Do feel free to report any other bugs you may find.