This file is indexed.

/usr/share/X11/xkb/symbols/terminate is in xkb-data 2.5-1ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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partial default modifier_keys
xkb_symbols "ctrl_alt_bksp" {
    key <BKSP> {
        type="CTRL+ALT",
        symbols[Group1] = [ NoSymbol, NoSymbol, NoSymbol, NoSymbol, Terminate_Server ]
    };
};