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/lib/partman/finish.d/70crypto_aptinstall is in ubiquity 2.18.7.

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#!/bin/sh

# Installs userspace tools and helper packages in the target system.
#

. /lib/partman/lib/base.sh

dm_crypt=no

for dev in $DEVICES/*; do
	[ -d "$dev" ] || continue
	cd $dev
	open_dialog PARTITIONS
	while { read_line num id size type fs path name; [ "$id" ]; }; do
		[ "$fs" != free ] || continue
		[ -f $id/method ] || continue
		[ -f $id/crypto_type ] || continue

		method=$(cat $id/method)
		[ $method = crypto ] || [ $method = crypto_keep ] || continue

		type=$(cat $id/crypto_type)
		case $type in
			dm-crypt)
				dm_crypt=yes
				;;
		esac
	done
	close_dialog
done

if grep -q " device-mapper$" /proc/misc; then
    # We can't check the root node directly because root could be
    # on an LVM LV on top of an encrypted device
    if type dmsetup >/dev/null 2>&1 && \
	   dmsetup table | cut -d' ' -f4 | grep -q "crypt" 2>/dev/null; then
		apt-install cryptsetup || true
	fi
fi

if grep -q " device-mapper$" /proc/misc; then
	# We can't check the root node directly because root could be
	# on an LVM LV on top of an encrypted device
	if type dmsetup >/dev/null 2>&1 && \
	   dmsetup table | cut -d' ' -f4 | grep -q "crypt" 2>/dev/null; then
		apt-install cryptsetup || true
	fi
fi