dpkg -l | grep -i nvidia
ii  bbswitch-dkms                                               0.7-2ubuntu1                                           amd64        Interface for toggling the power on nVidia Optimus video cards
ii  libcuda1-340                                                340.96-0ubuntu0.14.04.1                                amd64        NVIDIA CUDA runtime library
ii  nvidia-340                                                  340.96-0ubuntu0.14.04.1                                amd64        NVIDIA binary driver - version 340.96
pc  nvidia-343                                                  343.36-0ubuntu1~xedgers14.04.1                         amd64        NVIDIA binary driver - version 343.36
pc  nvidia-346                                                  346.22-0ubuntu1~xedgers14.04.1                         amd64        NVIDIA binary driver - version 346.22
ii  nvidia-opencl-icd-340                                       340.96-0ubuntu0.14.04.1                                amd64        NVIDIA OpenCL ICD
ii  nvidia-prime                                                0.6.2                                                  amd64        Tools to enable NVIDIA's Prime
ii  nvidia-settings                                             355.06-0ubuntu0~xedgers14.04.1                         amd64        Tool for configuring the NVIDIA graphics driver