I'm afraid you don't understand what Zentyal is made of.
I suggest you have a look at documentation
You will understand that:
- Zentyal already runs on to of Ubuntu
- Zentyal is not control panel but full server made of multiple modules (meaning "control panel" alone is meaningless
- you can install Zentyal on your desktop but this will turn your desktop into (kind of) server
- you can access Zentyal control panel remotely as this is a web interface
I hope this clarifies the matter... or do I misunderstand your goal?