Could you check if the following packages are installed already and install
them if not?
python-gst0.10
python-glade2
libgnomevfs2-extra
And what happens if you try to open the file with totem?
** Changed in: rhythmbox (Ubuntu)
Status: New => Incomplete
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rhythmbox fails to play m3u file (internet radio)
https://bugs.launchpad.net/bugs/305294
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