Fixes /usr/lib/libnvidia-gtk3.so.440.33.01: undefined symbol: gtk_widget_hide_on_delete
Step 1 : Check nvidia-smi for version first
Step 2: Locate nvidia-settings with same version as Step 1 at https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1604/x86_64/ and download with wget to your system.
Step 3: Follow steps below replacing XXX with the version you downloaded.
sudo apt-get remove nvidia-modprobe nvidia-settings sudo dpkg -i nvidia-settings_XXX.deb sudo reboot now