Rhythmbox problem

[Bill Mills-Curran]

Problem: Rhythmbox has suddenly stopped being able to play from a
(radio) network stream.  It had been able to play previously, but
stopped.  I think the problem occurred when I had rhythmbox running,
but not playing anything while I was playing something on youtube.

I've tried these URLs, and they both fail:

http://www.wbur.org/wp-content/themes/wbur/live_stream/ogg.m3u

http://streams.wgbh.org/wgbh.m3u

Both streams work fine with VLC.  Rhythmbox works with at least some
of my music collection formats.  I can play podcasts OK.

I always start rhythmbox from a terminal window.  Here are the error
messages in the terminal window that I get when trying to play either
stream:

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
bcurran_silver> ** Message: don't know how to handle text/uri-list
Rhythmbox-Message: Missing plugin:
gstreamer|0.10|rhythmbox|text/uri-list decoder|decoder-text/uri-list

(rhythmbox:13231): GLib-GObject-WARNING **: invalid uninstantiatable
type `(null)' in cast to `GstMiniObject'

(rhythmbox:13231): GStreamer-CRITICAL **: gst_mini_object_unref:
assertion `mini_object->refcount > 0' failed
no application found
Rhythmbox-Message: No installation candidate for missing plugins
found.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

I also get a popup: Couldn't start playback
A text/uri-list decoder plugin is required to play this stream, but
not installed.

New additional error message that I get just starting rhythmbox.

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
bcurran_silver> rhythmbox &
[2] 16884
bcurran_silver> 
(rhythmbox:16884): Rhythmbox-WARNING **: Could not open device
/dev/radio0
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

System & installation info:

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
bcurran_silver> rhythmbox --version
GNOME rhythmbox 0.11.5

bcurran_silver> lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:       Ubuntu 8.04.3 LTS
Release:           8.04
Codename:          hardy
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Any suggestion on how to recover my ability to play radio streams with
rhythmbox?

TIA,
Bill