I use the NVIDIA binary driver 367.57 selected in the "Additional Drivers" tab in "Software and updates". It works perfectly, except that the option "Prime" is not showing in NVIDIA X Server Settings. What should I do ? Should not Prime be automatically installed with the 367.57 drivers ?
Maybe the installer did not recognize that the computer has a hybrid graphics solution.
Normally the package
nvidia-prime should be installed alongside the NVIDIA drivers automatically - to do it manually, open a terminal and execute the following command :
sudo apt install nvidia-prime
Now you can find the tab PRIME Profiles in the NVIDIA X Server Settings application.
Update addressing your comment that the package
nvidia-prime is already installed
Maybe something went wrong during the first installation process of the NVIDIA drivers.
Therefore un-install and re-install the packages
sudo apt purge nvidia-prime nvidia-settings sudo apt install nvidia-prime nvidia-settings
As you did not provide further information about your graphics hardware, NVIDIA Prime is only effective when the computer has an integrated intel AND a dedicated NVIDIA graphics adapter.
Update addressing the comment in which you provided information about the hardware
As you have very new graphics hardware - using the latest stable drivers may solve the issue.
First uninstall every NVIDIA related software you have installed on your operating system :
sudo apt purge nvidia* sudo reboot
After the restart install the latest official NVIDIA drivers 375.20 from the long-lived branch :
sudo add-apt-repository ppa:graphics-drivers/ppa sudo apt update sudo apt install nvidia-375 nvidia-prime sudo reboot
nvidia-prime is its own separate package that needs to be installed.
sudo apt-get install nvidia-prime
See link: How am I supposed to use nvidia-prime?