I have problems of my own trying to mine Eth on Ubuntu nobody is helping me with but you should update your driver. The 1080 ti came out after that driver was made. For step 4, enter 'sudo apt-get install nvidia-381'

http://www.linuxandubuntu.com/home/how-to-install-latest-nvidia-drivers-in-linux

You should update your driver. The 1080 ti came out after that driver was made. For step 4, enter 'sudo apt-get install nvidia-381'

http://www.linuxandubuntu.com/home/how-to-install-latest-nvidia-drivers-in-linux