alsamixergui software package provides graphical soundcard mixer for ALSA soundcard driver, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install alsamixergui
alsamixergui is installed in your system.
Make ensure the alsamixergui package were installed using the commands given below,
$ sudo dpkg-query -l | grep alsamixergui *
You will get with alsamixergui package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Sound |
| Package | alsamixergui |
| Version | 0.9.0rc2-1-9.1 |
| Description | graphical soundcard mixer for ALSA soundcard driver |
| Sub Section | Sound |