Linux Capable published a tutorial about installing Linux Kernel 5.18 on Ubuntu 20.04 LTS.
How to Install Linux Kernel 5.18 on Ubuntu 20.04 LTS
Learn how to install Linux Kernel 5.18 on Ubuntu 20.04 LTS Focal Fossa using the command line terminal to get the latest kernel support.
How to Install Linux Kernel 5.18 on Ubuntu 20.04 LTS - LinuxCapable