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/lib/partman/choose_partition/20auto/do_option 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

code=99 # signals a retry
while [ $code = 99 ]; do
	ask_user /lib/partman/automatically_partition
	code=$?
	if [ $code -ge 128 ] && [ $code -lt 192 ]; then
		exit $code # killed by signal
	elif [ $code -ge 100 ]; then
		# 255: backup from subsidiary question; break and return to
		# choose_partition menu
		# 100-127, 192-254: attempt to skip the manual partitioner
		# (from display.d), which isn't appropriate if the manual
		# partitioner has already been displayed, so treat this
		# exactly like backup
		exit 0
	fi
done
exit $code