Ubuntu 12.04 server x64
CyberPower Power Panel Business Edition 2.2.1

Does anyone know why PowerPanel fails to talk to the ttys0 serial port in 12.04? It works fine in 11.10 and 11.04. And it works well through a virtual box of 11.04 installed inside of host 12.04. But when installed directly on the 12.04 system, it fails to communicate with the serial port. Was something 'subtly' changed? Can it be tweaked back? I really don't like having to run the UPS control program through a virtual box to control the system. It makes shutting down very dirty.