Upgrade from Focal > Groovy > Hirsute and Nvidia 340 driver failed to install with
Everything else went OK apart from empty software boutique just the Nvidia driver failure.
So did a fresh install from the latest daily current and still Nvidia driver failure.
This is not a bug as I found out by searching online and finding Nvidia no longer supports this newer Kernel
Everything seems to work fine except I have to use the nouveau driver for display as Nvidia have dropped support for the Kernel which we are going to be using.
So as Linus Torvalds gestured to Nvidia