This file is indexed.

/lib/partman/active_partition/50erase/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

set -e

dev=$1
id=$2
part=$dev/$id

cd $dev

choice_erase () {
	if [ -f $part/skip_erase ]; then
		db_metaget partman-crypto/text/no_erase_data description || RET=''
		erase=${RET:-no}
	else
		db_metaget partman-crypto/text/yes_erase_data description || RET=''
		erase=${RET:-yes}
	fi

	db_metaget partman-crypto/text/erase_data description
	printf "erase\t%s\${!TAB}%s\n" "$RET" $erase
}

[ -f $part/method ] || exit 0
method=$(cat $part/method)

if [ $method = crypto ]; then
	choice_erase
fi