Same issue here with a newly installed Ubuntu 12.04 Beta 2.
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https://bugs.launchpad.net/bugs/935749
Title:
rhythmbox stops playing next song
To manage
Various users, including myself, reported the same problem in the German
ubuntuusers.de forum. Two error messages appear when running Rhythmbox
under XUbuntu 8.04 stating that the Jamendo and Magnatune plugin can not
be loaded. After confirming these messages, Rhythmbox seems to work
fine. Both