Today I ran apt-get dist-upgrade on my Raspberry Pi (Jessie) and saw that the packages included "bootloader" and "kernel," in addition to many others. I rebooted when the upgrade was finished and was surprised to see that the kernel was the same as the one that was installed prior to the dist-upgrade (4.14.98-v7+ #1200 SMP Tue Feb 12 20:27:48 GMT 2019 armv7l GNU/Linux). I think the date on the kernel shown in the dist-upgrade listing was in April, but don't remember. Why didn't the dist-upgrade install that kernel?
Ray