'why do lxc containers not have latest/host linux-headers available?

Notices my lxc containers are 1 behind in available linux-headers.

Eg, a container created from ubuntu:20.04 has the same kernel as my host 5.15 (as expected), and has an identical sources.list. But on my host I can install linux-headers5.15. whereas in the container the max available is 5.14

I've tried a couple images (ubuntu default/desktop/cloud, focal/20.04/21.10)...Centos 9 desktop and cloud



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