gstreamer1.0-x software package provides GStreamer plugins for X11 and Pango, 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 gstreamer1.0-x
gstreamer1.0-x is installed in your system.
Make ensure the gstreamer1.0-x package were installed using the commands given below,
$ sudo dpkg-query -l | grep gstreamer1.0-x *
You will get with gstreamer1.0-x package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Libraries |
| Package | gstreamer1.0-x |
| Version | 1.8.0-1ubuntu1 |
| Description | GStreamer plugins for X11 and Pango |
| Sub Section | Libs |