Not sure how I got into this situation, but when grub loads up it shows I'm auto loading 4.15.0-51, I installed the 4.15.0-65 kernel via apt-get, but I can't figure out how to make it active. Can anyone lend me a hand. I'm not super familiar with grub, and was actually surprised to see it, as I'm used to just loading directly into Linux Lite. I have confirmed with uname that kernel 4.15.0-51 is presently the active kernel.
Hold down Shift key when your pc boots. Then just use the arrow keys to move around Grub, then press Enter to boot a selected kernel.
I actually had tried that, but holding either left or right shift on boot did not get me to the selectable grub menu, grub would still show, but just showed the old kernel as it auto loaded. I ended up having to modify the "etc/default/grub" directly and run a "sudo update-grub" to get things working.
When you install a newer kernel from the terminal rather than the usual dist-upgrade path you normally have to update grub afterwards.
TC