To prevent the key sequence [Ctrl]-[Alt]-[Delete] from
rebooting the computer and from displaying the Log Out dialog, you must make configuration changes
at both the window manager level and at the system level.
Setting the following gconf keys will prevent [Ctrl]-[Alt]-[Delete] from
displaying the Log Out dialog.
Figure 4-2 that the default global keybinding for [Ctrl]-[Alt]-[Delete] is
attached to the gconf key run_command_1.
Figure 4-2. Default Metacity Action for [Ctrl]-[Alt]-[Delete]
To change the window manager's interpretation of [Ctrl]-[Alt]-[Delete], change
the run_command_1 key value from
gnome-session-save --kill to something
benign as shown in
Figure 4-3. (Note that the appropriate key to change is
Figure 4-3. Resetting the run_command_1 Key
To disable [Ctrl]-[Alt]-[Delete] at the
system level, comment out the relevant section in /etc/inittab as shown below:
# Trap CTRL-ALT-DELETE
#ca::ctrlaltdel:/sbin/shutdown -t3 -r now
To disable the [Ctrl]-[Alt]-[Backspace] key
combo from terminating the X session, add a Serverflags section to the X configuration file /etc/X11/xorg.conf and add a DontZap option to the section.
Option "DontZap" "yes"