Skype is the most popular client to make telephone calls over the Internet. Skype lets us make international calls without any limits. With Skype, we can also receive calls, although that service is not free of cost.

Now, Skype is easily available for windows, but it is not present in the default repositories  for Ubuntu Linux. To add Skype to your Ubuntu installation, here are three easy steps.

1. Run this command from the command line. This adds support for Mediubuntu repositories.
   sudo wget http://www.medibuntu.org/sources.list.d/feisty.list -O /etc/apt/sources.list.d/medibuntu.list
2. This compound command adds the GPG key for Mediubuntu repositories.
   wget -q http://packages.medibuntu.org/medibuntu-key.gpg -O- | sudo apt-key add - && sudo apt-get update
3. This third and last command, installs Skype into your Ubuntu system.
   sudo aptitude install skype

If you had already enabled the Mediubuntu repositories,

you can execute this in the terminal to install Skype :

sudo apt-get install skype

This will install Skype into your system, which will be available under the Applications->Internet category.