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/lib/partman/choose_partition/35crypto/choices is in ubiquity 2.21.63.

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#!/bin/sh

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

# Only show menu option if there is at least one partition that can be used
# as a physical volume for encryption
[ $(crypto_list_allowed | wc -l) -gt 0 ] || exit 0

db_metaget partman-crypto/text/configure_crypto description
printf "crypto\t%s\n" "$RET"