Disable CTRL+ALT+Del keys

Open /etc/inittab file, enter:

vi /etc/inittab

Search for line that read as follows:

ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now

And remove the line or comment out the above line by putting a hash mark (#) in front of it:

ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now

Save the file and exit to shell promot. Reboot system to take effect or type command:

init q

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