I'm attempting to follow the guide below but having some issues.  First, there is no option to delete the docker.img file when I shut down the docker service.  So, I opened terminal and removed the docker.img file that way.  Second problem, when I re-enable the docker service the dockers are still listed as there and running and I can't stop them.  When I add a container and select the "my-xxxx" template and click apply it just hangs at stopping the docker in question.  Any ideas?

 

So.....mark this as solved.  Ended up rebooting, logging out, then logging back in.  Dockers were no longer shown (so system didn't have to stop something that wasn't running) and was able to re-add my paths.