This file is indexed.

/lib/partman/choose_method/45efi/choices is in ubiquity 18.04.14.

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

. /usr/share/debconf/confmodule

dev=$1
id=$2

[ -e /var/lib/partman/efi ] || exit 0

if [ -f /var/lib/partman/ignore_uefi ]; then
	exit 0
fi

if [ -f /var/lib/partman/ignore_uefi ]; then
	exit 0
fi

db_metaget partman-efi/text/efi description

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