Ubuntu-Solutions-Engineering/cloud-installer — pull request #90 by mattyw (2014-07-01 17:16:50+00:00)
Title: config option is lxc-clone

After running the script I tried (and got):

$ juju status
WARNING unknown config field "lxc-use-clone"
WARNING unknown config field "lxc-use-clone"
WARNING unknown config field "lxc-use-clone"

I believe the actual option is **lxc-clone: true**