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Is there a way to disable the Switch User option from a locked screen on Fedora 15? I've tried this way, but no luck, since gconf-editor has no effect.

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Is there a special reason why you want to disable this option? –  jofel Mar 14 '12 at 13:36
    
@jofel others can shutdown the machine or log in while I have it locked. –  slybloty Mar 14 '12 at 13:56
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Shutdown is usually forbidden by polkit if more than one user is logged in. And as Linux is a multi-user system, there should be no (security) problem, if multiple users are logged in. –  jofel Mar 14 '12 at 14:07
    
But if someone logs in as root and runs or sudos a shutdown command, won't that override the multiple user restriction? –  FloppyDisk Mar 14 '12 at 17:03
    
@FloppyDisk It doesn't matter if root does it. My concern is about anybody else. –  slybloty Mar 14 '12 at 19:27

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I found 2 ways of doing this. Both involve XScreenSaver.
Either deactivate or uninstall gnome-screensaver and start the XScreenSaver (install if needed), or switch to Xfce which is using it.
XScreenSaver can easily be controlled and configured to disable the switch user feature.

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