changing the user on locked screen doesn't work

[Szymon]

When my screen is locked and I'm clickin "change user", system doesn't switch to other user account - there is only a black screen for a few moments and system commes back to the locked screen. When I unlock the screen i se an window with info:
You can't open a new screen. The name org.gnome.DisplayManager was not provided by any .service files.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gdm 3.0.4-0ubuntu11
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu2
Architecture: i386
CheckboxSubmission: 3f69a39cb03b646d12af44cf0cba23dc
CheckboxSystem: 3e53d3ea5811723345f19eff5070f9ab
Date: Wed Oct 5 21:27:47 2011
ExecutablePath: /usr/bin/gdmflexiserver
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100318)
SourcePackage: gdm
UpgradeStatus: Upgraded to oneiric on 2011-09-27 (8 days ago)

[Sebastien Bacher (seb128)]

thank you for your bug report, do you use gdm or lightdm? Is that still an issue with yesterday's update:

lightdm (1.0.1-0ubuntu3) oneiric; urgency=low

  * debian/patches/05_gdmflexiserver_not_in_PATH.patch:
    - Make sure to insert our own utility path into PATH after PAM
      sets PATH, not before. This ensures gdmflexiserver is present
      in PATH and can be found by gnome-screensaver, gnome-shell, etc.

it should have fixed it...

[Szymon (mody)]

I use lightdm but I upgraded to oneiric in July so gdm packages are still installed. Actually after update lightdm package I can't switch user at all. When i use switchin user applet and the login screen opens I write a password and this is over. Nothing happens - I cant login enywhere cos there is no place to put the password - its blank.

[Szymon (mody)]

still the same problem..

[Sebastien Bacher (seb128)]

does it work if you uninstall gdm?

[Szymon (mody)]

I have uninstalled gdm and reinstalled lightdm and it didn't change anything.

Right now I've decided to come back to gdm. it works. Not as smooth as in previuos version.. but works at all.
With gdm when I use switching user applet - system first shows the locked screen then I have to click on Switch user (on the window with password) and then I see gdm main screen and have to click again on user I want to turn on - I have to do the same action (clickin to confirm switching the user) three times.

[Serhiy (xintx-ua)]

mody, do you have kdm installed?
For me lightdm and gdm both work but it failed the same when I tried to use kdm.

[Szymon (mody)]

Well I used gnome and now unity so I've no kdm installed. GDM works but there is a lot of clickin :|

[Launchpad Janitor (janitor)]

[Expired for gnome-screensaver (Ubuntu) because there has been no activity for 60 days.]