jack-mixer software package provides JACK Audio Mixer, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install jack-mixer
jack-mixer is installed in your system.
Make ensure the jack-mixer package were installed using the commands given below,
$ sudo dpkg-query -l | grep jack-mixer *
You will get with jack-mixer package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Sound |
| Package | jack-mixer |
| Version | 9-3build1 |
| Description | JACK Audio Mixer |
| Sub Section | Sound |