I have Ubuntu 20.04 64 bit on Raspberry Pi 4.
The CPU architecture is ARM64.
Can I use Canonical LivePatch easily somehow?
The Livepatch Datasheet is conspicuous and clear on this topic:
Architecture: 64-bit (x86_64 or amd64)
ARM64 is not supported by Livepatch.
There are patches but it's not ready yet.
It seems like it will take a few years: