Comment 3 for bug 1900356

That's what it looks like here (the 20.04 machine I sent the bug report from):

# snap start lxd
error: cannot perform the following tasks:
- start of [lxd.activate lxd.daemon] (# systemctl start snap.lxd.activate.service snap.lxd.daemon.service
Failed to start snap.lxd.activate.service: Unit snap.lxd.activate.service not found.
Failed to start snap.lxd.daemon.service: Unit snap.lxd.daemon.service not found.
)
- start of [lxd.activate lxd.daemon] (exit status 5)

# snap list | fgrep lxd
lxd 4.6 17629 latest/stable canonical* disabled

But

# snap enable lxd
lxd enabled

# snap start lxd
Started.

So my 20.04 machine is definitely unable to start a disabled LXD snap.