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/lib/partman/check.d/07basic_method_only is in ubiquity 18.04.14.

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

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

	for part in $partitions; do
		id=${part%,*}
		num=${part#*,}
		[ -f $id/method ] || continue
		method=$(cat $id/method)
		[ "$method" = format -o "$method" = keep ] || continue
		[ ! -f $id/acting_filesystem ] || continue
		db_subst partman-basicmethods/method_only PARTITION "$num"
		db_subst partman-basicmethods/method_only DEVICE $(humandev $(cat device))
		db_input critical partman-basicmethods/method_only || true
		db_go || exit 1
		db_get partman-basicmethods/method_only
		if [ "$RET" = true ]; then
			exit 1
		fi
	done

done