diff -Nuar "$1" "$2" 
--- ubiquity.orig/d-i/source/partman-target/finish.d/fstab_hd_entries	2016-05-11 14:58:57.599808385 +0200
+++ ubiquity/d-i/source/partman-target/finish.d/fstab_hd_entries	2016-05-12 12:30:20.353759666 +0200
@@ -13,9 +13,19 @@
 
 # dev, mountpoint, type, options, dump, pass
 addfstab () {
+	lliurex_options="$(escape $4)"
+	lliurex_type="$(escape $3)"
+	if [ "$lliurex_type" = "ext4" ]; then
+		if [ "$lliurex_options" != "" ]; then
+			lliurex_options="acl,$lliurex_options"
+		else
+			lliurex_options="acl"
+		fi
+	fi
+
 	printf "%-15s %-15s %-7s %-15s %-7s %s\n" \
 		"$(escape "$1")" "$(escape "$2")" \
-		"$(escape "$3")" "$(escape "$4")" \
+		"$(escape "$3")" "$lliurex_options" \
 		"$5" "$6"
 }