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It’s turned off by default in a lot of distros these days but it can be turned back on. It used to be that editing /etc/X11/xorg.conf was recommended but because file inclusions are a thing these days, it makes more sense to create a new file /etc/X11/xorg.conf.d/enable-killing-xserver.conf:
Then restart the X server (which, these days, is pretty much a reboot). Or, going through the x.org documentation archives, it looks like you could dispense with the config files and run setxkbmap -option"terminate:ctrl_alt_bksp" in a terminal session and that’ll do the same thing.
It’s turned off by default in a lot of distros these days but it can be turned back on. It used to be that editing /etc/X11/xorg.conf was recommended but because file inclusions are a thing these days, it makes more sense to create a new file /etc/X11/xorg.conf.d/enable-killing-xserver.conf:
Section "ServerFlags" Option "DontZap" "false" EndSection Section "InputClass" Identifier "Keyboard Defaults" MatchIsKeyboard "yes" Option "XkbOptions" "terminate:ctrl_alt_bksp" EndSection
Then restart the X server (which, these days, is pretty much a reboot). Or, going through the x.org documentation archives, it looks like you could dispense with the config files and run
setxkbmap -option "terminate:ctrl_alt_bksp"
in a terminal session and that’ll do the same thing.