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/lib/partman/update.d/21lvm_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 lvm flag for partitions whose method is not
# lvm and sets it for partition whose method is lvm

. /lib/partman/lib/base.sh

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

cd $dev

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

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

# Don't fiddle with label on devices where there is no "real" partitioning
open_dialog GET_LABEL_TYPE
read_line label
close_dialog
if [ "$label" = loop ]; then
	exit 0
fi

has_lvm=no
flags=''
open_dialog GET_FLAGS $id
while { read_line flag; [ "$flag" ]; }; do
	if [ "$flag" != lvm ]; then
		flags="${flags:+$flags$NL}$flag"
	else
		has_lvm=yes
	fi
done
close_dialog

# Some flags make no sense in combination with lvm
cleanflags=''
for flag in $flags; do
	if [ "$flag" = raid ]; then
		continue
	elif [ "$flag" = swap ]; then
		continue
	else
		cleanflags="${cleanflags:+$cleanflags$NL}$flag"
	fi
done

if [ -z "$method" ] && [ "$has_lvm" = yes ]; then
	echo lvm >$dev/$id/method
	rm -f $dev/$id/use_filesystem
	rm -f $dev/$id/format
elif [ "$method" = lvm ] && [ "$has_lvm" = no ]; then
	open_dialog SET_FLAGS $id
	write_line "$cleanflags"
	write_line lvm
	write_line NO_MORE
	close_dialog
elif [ "$method" != lvm ] && [ "$has_lvm" = yes ]; then
	open_dialog SET_FLAGS $id
	write_line "$flags"
	write_line NO_MORE
	close_dialog
fi