Preventing the Ctrl-Alt-Backspace shortcut keys from restarting X
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Make a backup copy of your existing /etc/X11/xorg.conf file.
sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf_backup
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Open /etc/X11/xorg.conf for editing.
kdesu kate /etc/X11/xorg.conf
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Add the following lines to the end of the file:
Section "ServerFlags" Option "DontZap" "yes" EndSection
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Save the edited file. (an example)
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The change will take effect the next time you log in to KDE. If you want the change to take effect immediately, restart KDE manually. (See the section called "Restart KDE without rebooting the computer".)
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