To disable the reboot action taken by pressing the Ctrl+Alt+Delete key combination, comment out the following line in the file /etc/init/control-alt-delete.conf.
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To disable CTRL+ALT+DEL key is configured to use /etc/inittab file. Login as root and edit /etc/inittab file and remove ctrlaltdel entry. Type the following command # vi /etc/inittab
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