How to Get Audio Video Codecs

Normally by default after the installation the videos and sounds don't work due to no audio and video plug-ins. Though you tick "Install 3rd party software" in the early stage of the installation process, it really don't work out.

For these plug-ins to work, we have to install "Restricted Extras"
To install Open the terminal and enter the following lines    

sudo apt-get install ubuntu-restricted-extras

This will mainly install followings

• MP3 and un-encrypted DVD playback plug-ins
• Microsoft True Type core fonts
• Flash plug-in
• Codecs for common audio and video files

Or else you can go to software center and search for "Restricted Extras" and 

click on install.

After installing try out watching videos and most of the audio formats will 

work just fine...!!!