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/lib/partman/choose_method/25filesystem/do_option is in ubiquity 18.04.14.

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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

fs=$1
dev=$2
id=$3

mkdir -p $dev/$id

existing=no
for j in $(
		for i in /lib/partman/valid_filesystems/*; do
			[ -x $i ] || continue
			$i $dev $id existing
		done
	); do
		if [ "$j" = "$fs" ]; then
			existing=yes
		fi
done

if [ $existing = yes ]; then
	echo keep >$dev/$id/method
	rm -f $dev/$id/format
	> $dev/$id/use_filesystem
else
	echo format >$dev/$id/method
	> $dev/$id/format
	> $dev/$id/use_filesystem
fi

echo $fs >$dev/$id/filesystem

if [ ! -d $dev/$id/options ]; then
	mkdir $dev/$id/options
	if [ -f /lib/partman/mountoptions/${fs}_defaults ]; then
		for op in $(cat /lib/partman/mountoptions/${fs}_defaults); do
			echo "$op" >"$dev/$id/options/$op"
		done
	fi
fi

update_partition $dev $id