thanks for the bug report. can you please try the following in a
terminal and see if that might solve the problem for you.
$ sudo apt-get clean
$ sudo apt-get update
$ sudo apt-get install rhythmbox
** Changed in: rhythmbox (Ubuntu)
Importance: Undecided = Medium
** Changed in: rhythmbox
** Attachment added: AptOrdering.txt
https://bugs.launchpad.net/bugs/656090/+attachment/1676255/+files/AptOrdering.txt
** Attachment added: Dependencies.txt
https://bugs.launchpad.net/bugs/656090/+attachment/1676256/+files/Dependencies.txt
** Attachment added: Df.txt