To make an Addition to that: When you installed it with the modern Nvidia Drivers it installs the 550 Driver. Because this one is newer that the Drivers on the List in the ''Additional Drivers'' Tab it isn't listed there and the last Option ist shown.
If You should have the 6.8 Kernel installed, the 545 Driver that @Aravisian named in the command could causing Issues. There would be the 535 or 550 Driver a better Solution. Take a Look at this Post for that: