You can go in VLC to Tools --> Media Information / Tools --> Codec Information to get a lot of information about the DVD. If you get any problems with the DVD, please make sure to read some of the following links:
How can I play encrypted DVD movies?
My DVD's Will Not Play?
Discs in DVD Drive not being read
sudo apt-get install mediainfo-gui mediainfo
To Run: The GUI version is obviously mediainfo-gui. The terminal one is just
mediainfo, which you can use in the following way:
mediainfo -f SOURCE. For example
mediainfo -f /media/cyrex/moviedvd
sudo apt-get install lsdvd
lsdvd -x SOURCE. For example
lsdvd -x /media/cyrex/moviedvd
This are not all since typing **dvd* in the Software Center will give you many DVD players, editors, rippers, etc.. that most of them can give you information about your DVD.