You have several Options, all work well in Gnome
AcidRip is an automated front end for MPlayer/Mencoder (ripping and encoding DVD tool using mplayer and mencoder) written in Perl, using Gtk2::Perl for a graphical interface. Makes encoding a DVD just one button click!
sudo apt-get install acidrip
dvd-rip is a full featured DVD copy program written in Perl i.e. fron end for transcode and ffmpeg. It provides an easy to use but feature-rich Gtk+ GUI to control almost all aspects of the ripping and transcoding process.
It uses the widely known video processing swissknife transcode and many other Open Source tools. dvd::rip itself is licensed under GPL / Perl Artistic License. You can install dvd::rip as follows under Debian / Ubuntu Linux:
sudo apt-get install dvdrip
K9copy is a KDE DVD Backup tool. It allows the copy of a DVD9 to a DVD5. It is also known as a Linux DVD shrink. It supports the following features: The video stream is compressed to make the video fiton a 4.7GB recordable DVD. DVD Burning. Creation of ISO images. Choosing which audio and subtitle tracks are copied. Title preview (video only). The ability to preserve the original menus.
sudo apt-get install k9copy