dragora/archive/xserver/00-keyboard.conf

# Enable ctrl-alt-backspace keys to allow "Terminate Server"
Section "ServerFlags"
        Option "DontZap" "false"
EndSection

Section "InputClass"
        Identifier "Keyboard Defaults"
        MatchIsKeyboard "yes"
        Option "XkbOptions" "terminate:ctrl_alt_bksp"
EndSection