You keep lumping the linux distribution in with the linux kernel. They are separate things. You can run Ubuntu on an Amazon AKI. I run Debian on Amazon AKIs. An

You keep lumping the linux distribution in with the linux kernel. They are separate things. You can run Ubuntu on an Amazon AKI. I run Debian on Amazon AKIs. And if the latest Ubuntu depends on a particular kernel feature that the tested kernels don't have then it's probably not a good idea to run the latest Ubuntu.