It was after following the Wiki guide on ( Nvidia Optimus Manager ) . The last paragraph before the trouble shooting section states this:
( Here it is, you installed the Nvidia drivers with all the potential unlocked.
After this, you can install all the supported Vulkan drivers and play games with Wine, Lutris and Steam with full performance. ) . It was this statement which made me think the Vulkan drivers still needed to be installed .
Learning process , Thanks for all your help .
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