I'm running a fresh install of 7.10. I don't know why, but nothing appeared in the "Add software" section of setup (empty menu with no choices in it). I'd had this happen before and I usually just come back later and they are there. Well, my options did not appear to install libdvdcss2, so I went to the medibuntu website and downloaded the .deb package manually. I made sure it was the gutsy version and ran the install. However, this didn't work, even after a reboot (you need to reboot in regular ubuntu after installing libdvdcss2). I still can't watch dvds and receive the message that libdvdcss2 is probably not installed.
So then, I thought I would try to use the "add software" section. Now, the options have finally shown up in the list, but this doesn't install it either. So, please help! Why can't I install libdvdcss2?! I've used the .deb method before and it worked, but not this time. Anyone?