This file is indexed.

/lib/partman/active_partition/85erasepart/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
open_dialog VIRTUAL $id
read_line virtual
close_dialog
if [ "$virtual" = yes ]; then
	exit 0
fi

db_metaget partman-crypto/text/erase_data_partition description
printf "erase_partition\t${RET}\n"