Error: LXD unix socket "/var/snap/lxd/common/lxd/unix.socket" not accessible: Get "http://unix.socket/1.0": dial unix /var/snap/lxd/common/lxd/unix.socket: connect: resource temporarily unavailable

LXD
3

Canonical have taken the lxd project in-house - it’s no longer part of linuxcontainers.org - so questions about lxd should now be asked on Canonical forums:
LXD - Ubuntu Community Hub

linuxcontainers.org supports a community fork of lxd, called incus.

If you’re running Ubuntu 20.04, the problem may be this one: