Updating default kernel version
This issue springs from the good comments of @david56 made in #762.
It would be better for machines to specify "use the default", instead of hard coding a kernel version and having to the update that version all the time. We should have a PR to add that feature. Of course not all machine owner will want to do that, sticking with a specific kernel version has advantages in some circumstances.
The ask here is for a mechanism where a machine can say use major kernel version X.Y and let the build system automatically increment the minor version as releases go by. The idea is to help keep the kernel up to date with upstream security and bug fixes.
One gotcha is how to deal with machines that patch the kernel heavily and will break when the minor version is incremented. That can be handled on a case by case basis.