$ sudo apt-get update
$ sudo apt-get install mbrola-de7 

mbrola-de7 is installed in your system.

Make ensure the mbrola-de7 package were installed using the commands given below,

$ sudo dpkg-query -l | grep mbrola-de7 *

You will get with mbrola-de7 package name, version, architecture and description in a table

mbrola-de7 package basic information: