The Reluctant Kernel Update

Maybe I'm having a senior moment here, not really sure, but I sincerely don't recall seeing this before...
Usually all the kernel updates, thru Linux Mint's Update Manager, come in pairs, a package for the Kernel, and another for headers, but this time only one Kernel is available for update. I've seeing this on a couple of my lappies, except the MacBook White, where Update Manager offered to install both packages.
Tested the (somewhat cropped) install on the T60p, and everything went A Ok, even after a reboot, needless to say, all of the Kernel packages were installed.