$ sudo apt-get update
$ sudo apt-get install fglrx-updates 

fglrx-updates is installed in your system.

Make ensure the fglrx-updates package were installed using the commands given below,

$ sudo dpkg-query -l | grep fglrx-updates *

You will get with fglrx-updates package name, version, architecture and description in a table

fglrx-updates package basic information: