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/lib/partman/choose_method/50crypto/choices is in ubiquity 2.21.63.

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
. /lib/partman/lib/crypto-base.sh

dev=$1
id=$2

cd $dev

# don't show crypto for already encrypted partitions
if [ -f crypt_realdev ]; then
	exit 0
fi

db_metaget partman/method_long/crypto description
printf "%s\t%s\n" crypto "$RET"