asmix software package provides display a volume knob, 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 asmix
asmix is installed in your system.
Make ensure the asmix package were installed using the commands given below,
$ sudo dpkg-query -l | grep asmix *
You will get with asmix package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | X Window System software |
| Package | asmix |
| Version | 1.5-4.1 |
| Description | display a volume knob |
| Sub Section | X42 |