Comment 7 for bug 623655

Here's my terminal session:
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bob@bob-ubuntu:~$ rhythmbox

(rhythmbox:17423): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed

(rhythmbox:17423): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT (object)' failed
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When I try to activate the music store plugin, I get the following:

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Traceback (most recent call last):
  File "/usr/lib/rhythmbox/plugins/umusicstore/__init__.py", line 20, in <module>
    from MusicStoreWidget import U1MusicStoreWidget
  File "/usr/lib/rhythmbox/plugins/umusicstore/MusicStoreWidget.py", line 24, in <module>
    from aptdaemon.defer import inline_callbacks
ImportError: cannot import name inline_callbacks

(rhythmbox:17423): Rhythmbox-WARNING **: Could not load plugin umusicstore

(rhythmbox:17423): Rhythmbox-WARNING **: Error, impossible to activate plugin 'Ubuntu One Music Store'
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