# Pastebin DkbF6lW0
async@riff:~/charms/jenkins-slave$ juju upgrade-charm --path ~/charms/jenkins-slave jenkins-slave-xenial 
ERROR series "precise" not supported by charm, supported series are: xenial,trusty
async@riff:~/charms/jenkins-slave$ juju upgrade-charm --switch ~/charms/jenkins-slave jenkins-slave-xenial 
ERROR series "precise" not supported by charm, supported series are: xenial,trusty