Comment 4 for bug 1795036

Originally ran into this trying to use lxd on cosmic as described in
 https://github.com/lxc/lxd/issues/5081

Simple test case was just:
 a.) launch fresh cosmic instance
 b.) sudo snap install lxd
 c.) sudo lxd waitready
 d.) sudo lxd init --auto --storage-backend=dir

In the failure case, that takes quite a while, exits 1 and writes:

Error: Failed to create network 'lxdbr0': Failed to list ipv4 rules for LXD network lxdbr0 (table filter)