That won’t really work with 16.04 since this is a hybrid graphics notebook with recent AMD igpu which needs a recent kernel to work. Without the igpu, the secondary nvidia gpu can’t do anything.
Please install at least Ubuntu 18.04, upgrade HWE stack to get a recent kernel, install nvidia driver in Ubuntu’s Software&Updates application, then follow this on how to enable prime on amd/nvidia combos:
https://forums.developer.nvidia.com/t/nvidia-xconfig-doesnt-do-what-i-want-it-to-nor-does-nvidia-settings/107883/7?u=generix
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