gem software package provides Graphics Environment for Multimedia - Pure Data library, 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 gem
gem is installed in your system.
Make ensure the gem package were installed using the commands given below,
$ sudo dpkg-query -l | grep gem *
You will get with gem package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Graphics |
| Package | gem |
| Version | 1:0.93.3-9build1 |
| Description | Graphics Environment for Multimedia - Pure Data library |
| Sub Section | Graphics |