Configuring environments.yaml for lxd

[Daniel Bidwell]

I have reinstalled my machine with ubuntu 15.10 to get lxd.  I have
juju-1.25.0-wily-amd64.  lxc image list images: returns a list of
images and I have created an lxc container with:
	lxc launch images:ubuntu/trusty/amd64 lxc-name

I have an entry in .juju/environments.yaml that looks like:

    lxd-local:
        type: lxd
        container: lxc
        default-series: trusty
        admin-secret: local-lxc

juju status returns

environment "lxd-local" has an unknown provider type "lxd"

What am I still missing?  What do I need to do to recognize lxd as a
provider?
-- 
Daniel Bidwell <drbidwell at gmail.com>