This file is indexed.

/lib/partman/choose_method/45biosgrub/choices is in ubiquity 2.18.7.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

. /lib/partman/lib/base.sh

dev=$1
id=$2

cd "$dev"

valid_biosgrub=no
open_dialog VALID_FLAGS $id
while { read_line flag; [ "$flag" ]; }; do
	if [ "$flag" = bios_grub ]; then
		valid_biosgrub=yes
	fi
done
close_dialog

[ "$valid_biosgrub" = yes ] || exit 0

db_metaget partman/method_long/biosgrub description

printf "biosgrub\t${RET}\n"