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Enable Ctrl+Alt+Backspace

To enable the Ctrl+Alt+Backspace shortcut to kill the X server by default for all users, you need to set the org.gnome.desktop.input-sources.xkb-options GSettings key.

Set the org.gnome.desktop.input-sources.xkb-options key

  1. Create a local database for machine-wide settings in /etc/dconf/db/local.d/00-input-sources:

    [org/gnome/desktop/input-sources]
# Enable Ctrl-Alt-Backspace for all users
xkb-options=['terminate:ctrl_alt_bksp']

  2. Override the user's setting and prevent the user from changing it in /etc/dconf/db/local.d/locks/input-sources:

    # Lock the list of enabled XKB options
/org/gnome/desktop/input-sources/xkb-options

  3. Update the system databases for the changes to take effect:

    # dconf update