Comment 10 for bug 618290

well it seems you are using/ had used unity ppa because this version of libido is in unity ppa. go to software sources and disable unity ppa (if its not already) update the package cache(apt-get update) and do the following in terminal

$ sudo apt-get install libido-0.1-0/lucid indicator-sound

PS: this bug is the same as bug 613198