Comment 5 for bug 1979333

Just as an additional note, the 1.7 version of the charm has had xenial support deliberately left off from a support perspective. Only 1.6 and 1.5 support (and will support) xenial. New tracks of the vault charm, for example, won't support bionic once it leaves LTS support. This is so that the Python code in the charm doesn't need to support old, EOL, versions of Python along with all the difficulties of supporting the associated Python modules.