At last! Udev does not know about what you have done, so one way of
beating it into submission is by rebooting. A gentler approach is
udevadm trigger --subsystem-match=input --action=change
Sorry for all the fuss...
It's not a fuss but an interesting situation. Nowadays, most users
would
not know of ctrl-alt-backspace as a way of exiting X. The DEs have
seen
to that. But, for the present, it can still be used if you know how to
activate it, as you have discovered.
You asked about ctrl-alt-del (or some other key combination) to
close X.
Please look at /usr/share/X11/xkb/symbols/terminate:
partial default modifier_keys
xkb_symbols "ctrl_alt_bksp" {
key <BKSP> {
type="CTRL+ALT",
symbols[Group1] = [ NoSymbol, NoSymbol, NoSymbol, NoSymbol,
Terminate_Server ]
};
};
Changing 'key' to 'DELE' might be a thought. Except . . .