When I click the switch user in the Actions Buttons in my panel, I get this message:

GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.DisplayManager was not provided by any .service files

I get the same message if I lock the screen and then select New Login option (I'm using xscreensaver).

If I type dm-tool switch-to-greeter in terminal I get into the login screen and can enter with a new user but that is not an elegant method. I want the actual buttons to work!

The other posts on this topic are either unresolved or do not work for me. Any advice?

EDIT: this seems to be a bug. I filled a new bug here and there is a similar bug reported here.


This is fixed in package whisker-menu but still not in package xfce4-panel. It appears that 'actions' is hardcoded to execute gdmflexiserver which only works if gdm is used instead of lightdm, which in turn is the xubuntu default.

You have, as always, several options:

  • Drop the actions item or disable user switch there and enable and use it in whisker-menu
  • Switch to gdm (apparently already installed)
  • Create a deviation from /usr/bin/gdmflexiserver to a script that calls dm-tool switch-to-greeter, like whisker-menu already does
  • Recreate 'actions' with a custom dropdown launcher duplicating all necessary commands

If I remember correctly, previous versions of lightdm would provide a gdmflexiserver compatibility hack that is no longer around.

  • Thanks, the first solution worked. I tried the second one (although I had to install gdm) but it tripled booting time, plus it looked much uglier so I discarded it. The fact that xfce4-panel is not fixed, does it mean I should report a bug? (I'm rather new into linux). – user308164 Sep 1 '14 at 2:47
  • You can submit xubuntu bugs here: bugs.launchpad.net/ubuntu/+source/xfce4-panel/+bugs. A cursory check reveals that this bug is not yet reported. – aquaherd Sep 1 '14 at 7:44
  • I decided to switch to gdm to fix this for my situation because I need to be able to lock my screen before another user uses the same computer, so they wouldn't be able to access the whisker-menu. – deltaray May 4 '16 at 11:07
  • The workaround with /usr/bin/gdmflexiserver to become a script that calls "dm-tool switch-to-greeter" worked great for me (with XUbuntu 16.04) – Johan Feb 10 '19 at 7:47

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