Although Ubuntu does not support ripping DVDs to digital video formats by default due to the closed-source nature of the DVD format, there are DVD conversion applications available in the Ubuntu software repositories. You can install a DVD conversion tool with just a few clicks from the default software repositories included with Ubuntu. Once you have installed a DVD ripping program, you can convert your DVDs to the MP4 file format or any other supported format. Amongst the available DVD ripping tools available in the Ubuntu software repository, OGMRip is one of the easiest to use.
Launch Synaptic Package Manager by selecting "System," "Administration" and then "Synaptic Package Manager."
Type "ogmrip" into the search box. Search results will automatically be displayed.
Click the check box beside the OGMRip package and select "Install." Synaptic Package Manager may prompt you to install additional packages required to run OGMRip. Include these packages in the installation.
Click "Apply" to install OGMRip.
Convert DVD to MP4
Insert the DVD you wish to convert to MP4.
Launch OGMRip by selecting "Applications," "Sound and Video" and then "DVD Encorder OGMRip."
Configure the DVD output according to your preferences including giving the file a title and selecting the video and audio tracks to include and then click "Extract."
Click the "Profile" drop-down menu and select the conversion format you wish to use. OGMRip is set up with MP4 profiles for a variety of devices including the iPhone, iPod, Sony PSP and BlackBerry. If you are converting to MP4 for usage on one of these devices, select that profile. Otherwise, select the profile that best fits your needs.
Click "Enqueue" and then "Execute" to convert the DVD to MP4. The file will be saved to your Home folder.
The conversion process can take a long time to complete so it is best to run OGMRip when you are not using your computer.