@Ken-Zug The only thing I might add to George’s answer is that we might add even newer kernels like 5.8.x to help people with newer hardware. There is nothing specific about 5.6.18 but it was a stable kernel version back then when people started asking about driver support on newer hardware.
The 4.9.x line is rock solid from a Linux and a FOG perspective - been tested many times in hundreds of setups. The 5.6.x and newer kernels have not been used as much…