Chech whether your gcc and g++ are the right version, i.e. version 5.
Go to "Software and Updates", then "Additional Drivers"; select NVIDIA drivers 375; install and restart.
Download the CUDA toolkit 8.0 from the official website.
Run the .run file accepting everything except the installation of the NVIDIA drivers, which already exist.
Go to the sample folder; run "make" and try the "matrixMul" script.