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

In this article we will be using the Bash script utility for Ubuntu and use it to easily install or uninstall kernels from the Ubuntu Kernel PPA
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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