nautilus plugin fails to load

[David Schneider]

Reported by peterv on IRC:

peterv: hi, the kupfer_provider.py nautilus plugin is not initializing. there is an error with dbus
peterv: here is the xsession-errors entry:

Initializing KupferSelectionProvider
Traceback (most recent call last):
  File "/usr/lib/nautilus/extensions-2.0/python/kupfer_provider.py", line 65, in __init__
    self.service = Object(bus_name, object_path=object_path)
  File "/usr/lib/pymodules/python2.7/dbus/gobject_service.py", line 71, in __init__
    bus_name=bus_name)
  File "/usr/lib/pymodules/python2.7/dbus/service.py", line 480, in __init__
    self.add_to_connection(conn, object_path)
  File "/usr/lib/pymodules/python2.7/dbus/service.py", line 571, in add_to_connection
    self._fallback)
RuntimeError: To make asynchronous calls, receive signals or export objects, D-Bus connections must be attached to a main loop by passing mainloop=... to the constructor or calling dbus.set_default_main_loop(...)

peterv: file selection is not working with Ctrl+G

System:
PPA kupfer on python2.7
python-dbus version 0.83.1-1
nautilus version 1:2.32.2.1-0ubuntu13
Unity desktop environment