cmd:
sudo wget http://www.medibuntu.org/sources.list.d/hardy.list --output-document=/etc/apt/sources.list.d/medibuntu.list
link: https://help.ubuntu.com/community/Medibuntu
2.Update the source list using the following command
sudo apt-get update
Install acrobat reader with firefox plugin in Ubuntu
sudo apt-get install acroread mozilla-acroread acroread-plugins
ref: http://www.ubuntugeek.com/how-to-install-adobe-pdf-reader-with-plug-in-for-mozilla-firefox-in-feisty-fawn.html
