When trying to run lxc this morning, snapd greeted me with an error:
$ lxc
chroot: cannot change root directory to '/var/lib/snapd/hostfs': Operation not permitted
$ snap version
snap 2.28.1+git397.aad08ec~ubuntu16.04.1
snapd 2.28.1+git397.aad08ec~ubuntu16.04.1
series 16
ubuntu 17.10
kernel 4.13.0-11-generic
$ snap info lxd
[...]
tracking: stable
installed: 2.18 (4375) 41MB -
refreshed: 2017-10-03 21:11:24 +0200 CEST
[...]