$ sudo apt-get update
$ sudo apt-get install libva-glx1 

libva-glx1 is installed in your system.

Make ensure the libva-glx1 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libva-glx1 *

You will get with libva-glx1 package name, version, architecture and description in a table

libva-glx1 package basic information: