# Remove the juju/daily ppa
sudo rm /etc/apt/sources.list.d/juju-ubuntu-daily-xenial.list
sudo rm /etc/apt/sources.list.d/juju-ubuntu-daily-xenial.list.save

# Remove juju
sudo apt-get remove --purge juju juju-2.0

# Update apt
sudo apt-get update

# Install juju
sudo apt-get install juju