Resolved: Ubuntu Kernel SRU Period had ended error

I have Ubuntu Livepatch running on one of my PCs, and I was getting the following error:

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*** System restart required. Kernel SRU period has ended ***

It was clear that I needed to update the kernel to continue to receive patches, but an apt-get upgrade wasn’t installing a new one. It wasn’t clear to me how to identify and update to the latest supported kernel, and it took some searching around.

I found this page, which lists the latest supported kernel for each Ubuntu LTS release: https://ubuntu.com/kernel/lifecycle

As this particular desktop PC is running 22.04 LTS, as of December 2023, the correct way to get the currently supported kernel is:

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sudo apt-get install --install-recommends linux-generic-hwe-22.04

And, this updated my PC to a supported kernel and addressed the issue.

Photo: Kata Tjuta