you need to enable it, once way described here:
https://wiki.archlinux.org/index.php/Xorg#Ctrl.2BAlt.2BBackspace_does_not_work
** Changed in: xorg (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1031604
Title:
cntrl-alt-del does not kill Xorg
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