title: NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running
body: <p>I have Ubuntu 16.04 running and Nvidia drivers and CUDA and cud installed a long time ago. Yesterday the server was rebooted, and after I login through ssh, I wanted to check the GPU using <code>nvidia-smi</code> but failed. <br><br>
  The error message was "NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running."</p>
  
  <p>The server has:
  <br>Ubuntu 16.04
  <br>Nvidia k80c x4
  <br>CUDA 9.0</p>
  
  <p>Has anyone faced this problem and can offer a possible solution? I don't really want to reinstall the driver as it could cause other problems.</p>