$ juju bootstrap source lxd 
Creating Juju controller "source" on lxd/localhost
Bootstrapping model "controller"
Starting new instance for initial controller
Launching instance
 - juju-9c8ec7-0d      
Installing Juju agent on bootstrap instance
Unable to fetch Juju GUI info: error fetching simplestreams metadata: cannot read product data, invalid URL "https://streams.canonical.com/juju/gui/streams/v1/com.canonical.streams-released-gui.sjson" not found
Waiting for address
Attempting to connect to 10.250.171.65:22
Logging to /var/log/cloud-init-output.log on remote host
Running apt-get update
Running apt-get upgrade
Installing package: curl
Installing package: cpu-checker
Installing package: bridge-utils
Installing package: cloud-utils
Installing package: tmux
Bootstrapping Juju machine agent
Starting Juju machine agent (jujud-machine-0)
Bootstrap agent installed
Waiting for API to become available: upgrade in progress (upgrade in progress)
Waiting for API to become available: upgrade in progress (upgrade in progress)
Waiting for API to become available: upgrade in progress (upgrade in progress)
Bootstrap complete, source now available.