To disable this behavior, open /etc/init/control-alt-delete. conf and then find out following 2 lines and add a hash mark at its very beginning of the line. We do not need to restart OS or any daemon, because the init daemon will automatically reload this change.

Can you disable Ctrl Alt Delete?

Open the Advanced tab, and in the Secure logon section, click to clear the Require users to press Ctrl+Alt+Delete check box if you want to disable the CTRL+ALT+DELETE sequence.

Does Ctrl Alt Del reboot Linux?

The key combination “Ctrl+Alt+Del”, when pressed on a virtual console (black-screen tty), causes the system to reboot. This is the default behavior and sometimes people don’t like this feature as it may cause accidental reboots of the system.