OK so there is a little modification of the policy prior to enablement:

def initialize_ufw():
    """Initialize the UFW firewall

    Ensure critical ports have explicit allows

    :return: None
    """

    if not config('enable-firewall'):
        log("Firewall has been administratively disabled", "DEBUG")
        return

    # this charm will monitor exclusively the ports used, using 'allow' as
    # default policy enables sharing the machine with other services
    ufw.default_policy('allow', 'incoming')
    ufw.default_policy('allow', 'outgoing')
    ufw.default_policy('allow', 'routed')
    # Rsync manages its own ACLs
    ufw.service('rsync', 'open')
    # Guarantee SSH access
    ufw.service('ssh', 'open')
    # Enable
    ufw.enable(soft_fail=config('allow-ufw-ip6-softfail'))

    # Allow GRE traffic
    add_ufw_gre_rule(os.path.join(UFW_DIR, 'before.rules'))
    ufw.reload()

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https://bugs.launchpad.net/bugs/1823862

Title:
  disco: unable to enable ufw

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