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.