indicator-sound-gtk2 software package provides System sound indicator., you can install in your Ubuntu 16.10 (Yakkety Yak) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install indicator-sound-gtk2
indicator-sound-gtk2 is installed in your system.
Make ensure the indicator-sound-gtk2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep indicator-sound-gtk2 *
You will get with indicator-sound-gtk2 package name, version, architecture and description in a table
| Distro | Ubuntu 16 10 yakkety yak |
| Section | Sound |
| Package | indicator-sound-gtk2 |
| Version | 12.10.0.1-0ubuntu5 |
| Description | System sound indicator. |
| Sub Section | Sound |