The problem is that you’re using a manually installed driver with Ubuntu 16.04 on a hybrid graphics system. That makes autoconfig defunct and the nvidia gpu is not used by the Xserver. If you really need to use 16.04, you’ll have to configure prime yourself. Please set kernel parameter “nogpumanager”, then follow this:
https://forums.developer.nvidia.com/t/official-driver-384-59-with-geforce-1050m-doesnt-work-on-opensuse-tumbleweed-kde/52620/2?u=generix
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