marco@T430:~$ juju destroy-controller local.dev
WARNING! This command will destroy the "local.dev" controller.
This includes all machines, applications, data and other resources.

Continue [y/N]? y
Destroying controller
ERROR cannot destroy controller "local.dev"

The controller has live hosted models. If you want
to destroy all hosted models in the controller,
run this command again with the --destroy-all-models
flag.

Models:
	admin@local/cabscabs (alive), 7 machines
	admin@local/default (alive)
	admin@local/gigaspace (alive), 8 machines