$ sudo apt-get update
$ sudo apt-get install openarena-081-players-mature 

openarena-081-players-mature is installed in your system.

Make ensure the openarena-081-players-mature package were installed using the commands given below,

$ sudo dpkg-query -l | grep openarena-081-players-mature *

You will get with openarena-081-players-mature package name, version, architecture and description in a table

openarena-081-players-mature package basic information: