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/lib/partman/update.d/21efi_sync_flag 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

# This script removes the efi flag for partitions whose method is not
# efi and sets it for partition whose method is efi

[ -e /var/lib/partman/efi ] || exit 0

. /lib/partman/lib/base.sh

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

cd $dev

if [ $fs = free ]; then
	exit 0
fi

method=
if [ -f $id/method ]; then
	method=$(cat $id/method)
fi

flags=''
open_dialog GET_FLAGS $id
while { read_line flag; [ "$flag" ]; }; do
	if [ "$flag" != boot ]; then
		flags="${flags:+$flags$NL}$flag"
	fi
done
close_dialog

open_dialog USES_NAMES
read_line uses_names
close_dialog

if [ "$method" = efi ] && [ ! -f $id/bootable ]; then
	open_dialog SET_FLAGS $id
	write_line "$flags"
	write_line boot
	write_line esp
	write_line NO_MORE
	close_dialog
	>$id/bootable
	>$id/efi_bootable
	if [ "$uses_names" = yes ] && [ "$fs" = fat32 ]; then
		open_dialog SET_NAME $id "EFI System Partition"
		close_dialog
	fi
	RET=''
elif [ "$method" != efi ] && [ -f $id/bootable ] && \
     [ -f $id/efi_bootable ]; then
	open_dialog SET_FLAGS $id
	write_line "$flags"
	write_line NO_MORE
	close_dialog
	rm $id/bootable
	rm $id/efi_bootable
	if [ "$uses_names" = yes ] && [ "$fs" = fat32 ] && \
	   [ "$name" = "EFI System Partition" ]; then
		open_dialog SET_NAME ""
		close_dialog
	fi
fi