This article covers how to install the Linux kernel 5.15 on Ubuntu 20.04 LTS Focal Fossa system. In fact, The Linux kernel is the main component of a Linux operating system (OS) and is the core interface between a computer's hardware and its processes.
How to check Updates for Kernel 5.15 ?
To keep your kernel 5.15 up to date, you will use the apt update and upgrade commands to pull updates from the PPA repository just like any other package on your Ubuntu system.
To check for updates and upgrade.
$ sudo apt update && sudo apt upgrade
Remember, for any kernel updates, and you will need to reboot your system.