[ubuntu-uk] Problems with watching training videos on Ubuntu

[John]

Hi everybody, I have got medibuntu installed, so I am not sure if that 
is the problem. I am pretty certain they are installed properly, I 
followed the instructions. I have the Macromedia Flash Player installed. 
I have looked in my plugins for FF, and the mplayer plugin is not there. 
How do I get that plugin? I looked in the Firefox Plugins but its not 
there, is it in the Repositories? I also have the 
*ubuntu-restricted-extras *installed as well, in the add/remove programs.

John