I would like to install the restricted extras, which I didn't select during the install
First, be warned that it might not be legal in some countries, because of software patents.
With that being said, here is how to install it, click here:
Or you can open up a terminal and run the following command:
Select yes, and you'll have
Just click the link do apt repository on:
Or go to software centre and install
Or use apt-get (type in terminal