Comment 6 for bug 1485784

If this happens again, can we get the contents of the directory:
  /var/lib/juju/containers/juju-trusty-lxc-template

It should contain some files along the lines of:

-rw-r--r-- 1 root root 1321 Jul 22 16:41 cloud-init
-rw------- 1 root root 43279 Nov 27 2014 console.log
-rw-r--r-- 1 root root 232552 Nov 27 2014 container.log
-rw-r--r-- 1 root root 111 Jul 22 16:41 lxc.conf

These will help us work out what went wrong with the container creation.