cuda 9.1 install ubuntu 16.04 apt-get

Install CUDA 9.1 on Ubuntu 16.04 using apt-get – easiest method

wget http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/cuda-repo-ubuntu1604_9.1.85-1_amd64.deb
sudo apt-key adv --fetch-keys http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/7fa2af80.pub
sudo dpkg -i cuda-repo-ubuntu1604_9.1.85-1_amd64.deb
sudo apt-get update
sudo apt-get install -y cuda nvidia-cuda-toolkit

Reboot!