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.