How to upgrade kernel to latest version on Ubuntu 20.04 Focal Fossa Linux - LinuxConfig.org

In this article we will be using the ubuntu-mainline-kernel.sh Bash script utility for Ubuntu and use it to easily install or uninstall kernels from the Ubuntu Kernel PPA
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-upgrade-kernel-to-latest-version-on-ubuntu-20-04-focal-fossa-linux

Step 3 should be run with sudo otherwise it appears to work, but may not.

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yep, I was going to say the same

Can’t reboot after following instructions because kernel 5.8.8 has invalid signature.

just boot old kernel from advanced ubuntu options in grub and try to sign it yourself once your in