Enable Universe Repository in Ubuntu

Universe is enabled by default so you usually don't need to do this.  If still its not enabled you could enable it easily.

First, open Ubuntu Software Center. Click on 'edit' and then 'software sources' to open the software sources window. Once that is open, check the box that says, "Community-maintained free and open-source software (universe)."

Now, all the universe packages should show up in software center just like all the other ones.


You could also edit the source file from the terminal:
sudoedit /etc/apt/sources.list

And then uncomment the universe section from the following lines:


#deb http://in.archive.ubuntu.com/ubuntu/ precise universe
#deb-src http://in.archive.ubuntu.com/ubuntu/ precise universe
#deb http://in.archive.ubuntu.com/ubuntu/ precise-updates universe
#deb-src http://in.archive.ubuntu.com/ubuntu/ precise-updates universe