Unable to fully remove Juju

Juju installs some upstart files for local provider environments. Prior to removing juju it can be removed via juju destroy-environment for each local environment. Post removal that the upstart files can be removed from /etc/init by hand, their prefixed with the environment name and user name. update-rc.d doesn't work with upstart files afaik.

what you are missing is:

stop juju-jon-sample-file-storage

This will tell upstart to stop respawning the service. Then, you can safely delete the file /etc/init/juju-jon-sample-file-storage.

The other is not respawning, so should not be a problem in your logs or won't be seen dangling in your process list.

Hope this helps.