Best keyboard mapping approach to make a Mac work like Ubuntu?
Ok, what you want to do is remap your modifiers:
Go to System Preferences and select Modifier Keys:

Then swap Cmd and Control.

note: in the shot they are not swapped
For reference, I do this with an external Razer Blackwidow for Windows (I want it to be like my Mac keyboard because I've been using Mac keyboards for 10 years).