gufw_daemon.py crashed with DBusException in call_blocking(): org.freedesktop.DBus.Error.AccessDenied: Connection ":1.58" is not allowed to own the service "gufw.Daemon" due to security policies in the configuration file

I tried launching from a Bash terminal:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/gufw/gufw.py", line 30, in <module>
    controler = Controller()
  File "/usr/share/pyshared/gufw/controller.py", line 24, in __init__
    self.firewall = Firewall()
  File "/usr/share/pyshared/gufw/model/Firewall.py", line 37, in __init__
    remote_object = bus.get_object("gufw.Daemon", "/Gufw_daemon")
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 244, in get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 246, in __init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 183, in activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 281, in start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 630, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: gufw 11.10.2-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
CasperVersion: 1.287.1
Date: Thu Feb 2 17:13:28 2012
ExecutablePath: /usr/share/gufw/daemon/gufw_daemon.py
InterpreterPath: /usr/bin/python2.7
LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
PackageArchitecture: all
ProcCmdline: python /usr/share/gufw/daemon/gufw_daemon.py
ProcEnviron:

PythonArgs: ['/usr/share/gufw/daemon/gufw_daemon.py']
SourcePackage: gui-ufw
Title: gufw_daemon.py crashed with DBusException in call_blocking(): org.freedesktop.DBus.Error.AccessDenied: Connection ":1.58" is not allowed to own the service "gufw.Daemon" due to security policies in the configuration file
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: