I wonder if this has anything to do with Snap install permissions glitch - #2 by jdstrand. Note that the lxd snap is quite special in what it is allowed to do via its lxd-support interface and it isn’t surprising that other snaps work fine where it might not. In general, you’ll need very specific kernel configurations for container managers like lxd to work correctly, so that could be something else to check. You might look at /snap/lxd/current/snap/hooks/* to see where it is failing.
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