First thing, I'm far from a Linux wiz...
Based on some questions and answers around playing mp4 files, I ran
sudo apt-get install ubuntu-restricted-extras.
Things seemed to be going fine until I got a pop up with the Microsoft EULA and what appeared to be an OK button at the bottom. Unfortunately, the button did nothing. After waiting quite a while and trying whatever I could to accept the license, I killed the process... probably not the smartest thing do have done?
So now can anybody give me some help in either uninstalling what is there or doing a complete install?