Having this exact same issue on two separate builds, same story. Ubuntu 18.04.2 installed on bare metal, grabbed the 13-13.10 installer script. Can't seem to save settings in the webGUI for the parking module either.I am having the same exact problem with 13-13 on Ubuntu 18.04 installed on bare metal. Like the OP, the parking module is the only one I am having trouble with. I'm trying to change 45 seconds to 300.