Just a quick post. If you ever need to simply extract data from DVDs or ISO images in Ubuntu, I whole heartedly recommend the program K9Copy. Searching the Ubuntu Software Center for "DVD Rip" or "DVD Extract" unfortunately does not provide this awesome program in the search results.
I only found it because I knew of it previously. It is extremely useful for opening an pre-ripped DVD-ISO file and extracting the data streams from it. As usual, I'm sharing this because I found it useful to know. Hope it helps someone out there.
P.S. Does anyone know how to tag programs in the Ubuntu Software Center with key words? K9Copy should absolutely be listed when you search for DVD Ripping.