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Basically, I want to disable multiple logins. The family laptop (not mine) has a problem with the x server -- at least it seems to be the x server. When two users are logged in simultaneously the x-server fails to start for the one who was logged in first. Having two users logged in seems to steal processor speed anyway. So I want to disable people from choosing 'switch user' over 'log out (username)' or 'shut down'.

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up vote 6 down vote accepted

There is a setting /desktop/gnome/lockdown/disable_user_switching in GConf that allows you to disable the user switching.

You can change this setting by running gconf-editor from the Alt+F2 "Run" dialog (depending on your distro, it might also be available somewhere in the menus).

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The following command will switch it from the command line: gconftool --set --type bool /desktop/gnome/lockdown/disable_user_switching true – Steven D Nov 7 '10 at 5:59

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