Why is there a special Kernel for every OS?
I was wondering why every OS (Ubuntu 16, 18, Ubilinux) gets a own Kernel by UP.
Why f.e. the Ubuntu 16.04 Kernel doesn't work with Ubuntu 18.04?
I get it, that a special Kernel is needed for the GPIO etc. But why can't one kernel be used for all Distros, like Linux?