How to Install Ubuntu 16.04 on a Retina MacBook 11,2

Can you elaborate on the case of ATI Radeon discrete display adaptor and how to disable it to work only with the integrated Intel Graphics only. The ATI heats up the machine and consumes a lot of the battery. The posts out there about Hybrid case switching do not work. I have a MacBook Pro 8,2 (2011).

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