gogo software package provides mp3 encoder, 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 gogo
gogo is installed in your system.
Make ensure the gogo package were installed using the commands given below,
$ sudo dpkg-query -l | grep gogo *
You will get with gogo package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Sound |
| Package | gogo |
| Version | 2.39b-7 |
| Description | mp3 encoder |
| Sub Section | Sound |