/usr/share/X11/xkb/symbols/terminate is in xkb-data 2.10.1-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | default partial modifier_keys
xkb_symbols "ctrl_alt_bksp" {
key <BKSP> {
type="CTRL+ALT",
symbols[Group1] = [ NoSymbol, NoSymbol, NoSymbol, NoSymbol, Terminate_Server ]
};
};
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