Question: Recently, I've got my Xubuntu to 16.04 and I found indicators in `xfce4-panel` have a problem.

As shown in the picture below, volume indicator is missing.

[![enter image description here](https://i.stack.imgur.com/Z9k7U.png)](https://i.stack.imgur.com/Z9k7U.png)

As ugly background color, I don't want to use `xfce4-pulseaudio-plugin` and `xfce4-mixer` is unavailable.

Does anyone know how to solve this problem?

Answer: 
You can still have `xfce4-mixer` in Xenial Xerus, though it was removed from official repository for some reasons. 

Go to this link of [ubuntuupdates.org](http://www.ubuntuupdates.org/package/mint_import/rafaela/import/base/xfce4-mixer) and download the mixer package's deb file. And then install it with `dpkg -i` command or gdebi. This worked for me in 16.04 and it doesn't have white background.

Hope this helps.
All settings->Sound -> bottom checkbox "Show sound volume in the menu bar"