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In the past, I was able to set "SystemMenu=false" in gdm.conf, to prevent normal users from being able to shut down the system.

In ubuntu 10.04, this does not work.

How can this be done?

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With gdm 2.30 in a default Ubuntu configuration, the shutdown menu is shown by the simple greeter and can be turned off by adding the following line in /var/lib/gdm/.gconf/apps/gdm/simple-greeter/%gconf.xml:

<entry name="disable_restart_buttons" type="bool" value="true"/>
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