jing software package provides RELAX NG validator, 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 jing
jing is installed in your system.
Make ensure the jing package were installed using the commands given below,
$ sudo dpkg-query -l | grep jing *
You will get with jing package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Text Processing |
| Package | jing |
| Version | 20131210+dfsg+1-4 |
| Description | RELAX NG validator |
| Sub Section | Text |