Ctrl-Alt-Backspace is now disabled, to reduce issues experienced by users who
accidentally trigger the key combo. Users who do want this function can enable
it in their xorg.conf, or via the command dontzap --disable.
修改 xorg.conf 來開啟
# sudo vim /etc/X11/xorg.conf
在最後的地方加入:
Section "ServerFlags"
Option "DontZap" "no"
EndSection
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