Add missing /etc/{subgid|subuid} in postinst

debian/login.postinst

@@ -16,14 +16,26 @@ then
 fi
 rm -f /etc/pam.d/login.pre-upgrade 2>/dev/null
 
-if [ "$1" = "configure" ] && [ "$2" = "" ]
-then
+if [ "$1" = "configure" ]; then
 	# Install faillog during initial installs only
-	if [ ! -f /var/log/faillog ] ; then
+	if [ "$2" = "" ] && [ ! -f /var/log/faillog ] ; then
 		touch /var/log/faillog
 		chown root:root /var/log/faillog
 		chmod 644 /var/log/faillog
 	fi
+
+	# Create subuid/subgid if missing
+	if [ ! -e /etc/subuid ]; then
+		touch /etc/subuid
+		chown root:root /etc/subuid
+		chmod 644 /etc/subuid
+	fi
+
+	if [ ! -e /etc/subgid ]; then
+		touch /etc/subgid
+		chown root:root /etc/subgid
+		chmod 644 /etc/subgid
+	fi
 fi
 
         # Create subuid/subgid if missing