Rick Gatewood@  graphics ppa work for me, you can try. If you face back
screen boot, then restart to recovery console:

mount -o remount,rw /
prime-select intel

If it don not work

apt-get purge nvidia*

If it work,  login to desktop add graphic ppa address as @Alberto Milone.
On additional driver, choose Nvidia 364.19 (open source).
This work for me, PRIME profile work with both Intel and Nvida

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https://bugs.launchpad.net/bugs/1559576

Title:
  Ubuntu GNOME boots to black screen when using proprietary Nvidia
  drivers on a laptop with Optimus

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