Hey.. I used the link:http://medibuntu.org/repository.php
and from there downloaded and installed the medibuntu repository using the termimal command line. I assumed that the mediubuntu repository would be in the 'Synaptic Package Manager', I was wrong. I checked the link you suggested: http://www.unixmen.com/how-to-add-me...minal-and-gui/
and found they were the same.
I think the problem at the time was I did not have that pesky 'libdvdcss2' on board, once I had it I was able tol watch my DVD without any problems.
Again thanks for pointing me in the right direction. I'll jhave to remember the bit abiut having to go through the whole rigmarole with mediubuntu repository after the release upgrade happens.