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/lib/partman/update.d/20detected_filesystem is in ubiquity 2.18.7.

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The actual contents of the file can be viewed below.

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#!/bin/sh

. /lib/partman/lib/base.sh

if [ -f /var/lib/partman/filesystems_detected ]; then
	exit 0
fi

dev=$1
num=$2
id=$3
size=$4
type=$5
fs=$6
path=$7
name=$8

cd $dev

if [ $fs = free ]; then
	rm -f $id/detected_filesystem
else
	open_dialog GET_FILE_SYSTEM $id
	read_line filesystem
	close_dialog

	if [ "$filesystem" = none ]; then
		rm -f $id/detected_filesystem
	else
		mkdir -p $id
		echo "$filesystem" >$id/detected_filesystem
	fi
fi