I fixed this problem in Lucid Lynx by installing gvfs-backends package.
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Couldn't display network:/// - Nautilus cannot handle network:locations
https://bugs.launchpad.net/bugs/185756
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Public bug reported:
Xubuntu Gutsy width latest updates
GNOME rhythmbox 0.11.2
GStreamer Core Library version 0.10.14
Fresh installed Rhythmbox doesn't start. Console output:
(rhythmbox:23522): GLib-GObject-CRITICAL **: g_type_instance_get_private:
assertion `instance != NULL instance-g_class
