Can not play DVD in ubuntu 14.04 [duplicate]

The mentioned package gstreamer1.0-plugins-bad is a package containing codecs needed to decode and play DVD video content. Here is its description:

Description-en: GStreamer plugins from the "bad" set

GStreamer is a streaming media framework, based on graphs of filters which operate on media data. Applications using this library can do anything from real-time sound processing to playing videos, and just about anything else media-related. Its plugin-based architecture means that new data types or processing capabilities can be added simply by installing new plug-ins.

GStreamer Bad Plug-ins is a set of plug-ins that aren't up to par compared to the rest. They might be close to being good quality, but they're missing something - be it a good code review, some documentation, a set of tests, a real live maintainer, or some actual wide use.

It is not installed by default in Ubuntu, because it contains proprietary or non-freely licensed codecs. You may still use them legally, but the Ubuntu developers preferred to only ship open-source software with the default installation.

The following command typed in a terminal window (Ctrl+Alt+T) should solve the problem:

sudo apt-get install ubuntu-restricted-extras

Alternatively, click the red button below which will take you to a site that helps you installing the package through your Software Center.
However, I strongly recommend using the terminal, because the other method might lead to problems because the Software Center fails to display you the License Agreement.

If you want, you can probably also just install the requested gstreamer1.0-plugins-bad codec package only (not tested by me, I can't guarantee that this will work):

sudo apt-get install gstreamer1.0-plugins-bad