Question: I Re-installed ubuntu two weeks ago and at the start I could control Rhythmbox from the sound menu, but now it disappeared and i don't know how to bring it back.

In "Sound prefernces...", in the "Applications" tab, rhythmbox is shown but i can only control it's volume.

For example in the start it was something like that (but for rhythmbox):
How it's supposed to be - 

![enter image description here](https://i.stack.imgur.com/4MhQF.png)

Answer: 
Make sure you have package `rhythmbox-plugins` installed. It contains MPRIS support which is vital for Sound Menu to work. After the package is installed, launch/restart Rhythmbox. Controls should appear in Sound Menu then.

You can find this package in Ubuntu Software Center:

[![Install via the software center](https://hostmar.co/software-banner)](https://apps.ubuntu.com/cat/applications/rhythmbox-plugins) 

Or you can install it through terminal using this command:

```
sudo apt-get install rhythmbox-plugins

```
Rhythmbox only shows the controls when it is running, but I'm sure you knew that.

I would try to re-install Rhythmbox:

```
sudo apt-get remove rhythmbox

```

Followed by:

```
sudo apt-get install rhythmbox

```