Installing Mac Drivers for Ubuntu 16.04 Xenial LTS
You are Welcome! The Tutorial shows you Step-by-Step How to Install the Mac Wi-fi and NVIDIA Graphics Drivers for Mac on Ubuntu 16.04 Xenial Xerus LTS 32/64-bit.
From this Release Ubuntu has Very Nicely Evolved in the Ability on Getting-Installed Easier and Automatically the NVIDIA Graphics Driver and other Proprietary Drivers!

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Press Cmd to Start Searching on Dashboard
Find and Run ‘Additional Drivers‘
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Select the Proprietary Drivers for Installed Devices.
Apply
If there is More than One Choice Select the ‘Tested’ or ‘Recommended’… -
Reboot.