$ sudo apt-get update
$ sudo apt-get install libgstreamer0.9-cil 

libgstreamer0.9-cil is installed in your system.

Make ensure the libgstreamer0.9-cil package were installed using the commands given below,

$ sudo dpkg-query -l | grep libgstreamer0.9-cil *

You will get with libgstreamer0.9-cil package name, version, architecture and description in a table

libgstreamer0.9-cil package basic information: