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I have Ubuntu 20.04 64 bit on Raspberry Pi 4.
The CPU architecture is ARM64.
Can I use Canonical LivePatch easily somehow?

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No.

The Livepatch Datasheet is conspicuous and clear on this topic:

Architecture: 64-bit (x86_64 or amd64)

ARM64 is not supported by Livepatch.

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There are patches but it's not ready yet.
It seems like it will take a few years:
https://www.spinics.net/lists/live-patching/msg06039.html https://www.phoronix.com/scan.php?page=news_item&px=ARM64-Linux-Live-Kernel-Patch

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