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/lib/partman/fstab.d/efi is in ubiquity 2.18.7.

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

ARCH="$(archdetect)"
case $ARCH in
    i386/mac|amd64/mac)
	# Not yet sure what to do on Intel Macs.  Mounting the EFI System
	# Partition on /boot/efi will change the behaviour of grub-install,
	# so it seems best to avoid it for the moment.
	exit 0
	;;
esac

seen_efi=
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
		[ -z "$seen_efi" ] || continue
		[ $fs != free ] || continue
		[ -f "$id/method" ] || continue
		method=$(cat $id/method)
		[ "$method" = efi ] || continue
		echo "$path" /boot/efi vfat defaults 0 1
		seen_efi=1
	done
	close_dialog
done