Install Skype in Ubuntu 14.04 / 13.10 / 13.04 / 12.10 / 12.04 using PPA
Open your terminal (ctrl+alt+t) and use the below command to add the PPA. Issue the password for the user when prompted.
Skype for Ubuntu 14.04
sudo sh -c "echo 'deb http://archive.canonical.com/ubuntu/ trusty partner' >> /etc/apt/sources.list.d/canonical_partner.list"
Skype For Ubuntu 13.10
sudo sh -c "echo 'deb http://archive.canonical.com/ubuntu/ saucy partner' >> /etc/apt/sources.list.d/canonical_partner.list"
Skype For Ubuntu 13.04
sudo sh -c "echo 'deb http://archive.canonical.com/ubuntu/ raring partner' >> /etc/apt/sources.list.d/canonical_partner.list"
Skype For Ubuntu 12.10
sudo sh -c "echo 'deb http://archive.canonical.com/ubuntu/ quantal partner' >> /etc/apt/sources.list.d/canonical_partner.list"
Skype For Ubuntu 12.04
sudo sh -c "echo 'deb http://archive.canonical.com/ubuntu/ precise partner' >> /etc/apt/sources.list.d/canonical_partner.list"
Skype for Ubuntu 11.10
sudo sh -c "echo 'deb http://archive.canonical.com/ubuntu/ oneiric partner' >> /etc/apt/sources.list.d/canonical_partner.list"
Skype for Ubuntu 11.04
sudo sh -c "echo 'deb http://archive.canonical.com/ubuntu/ natty partner' >> /etc/apt/sources.list.d/canonical_partner.list"
After adding the above command, update your system repository by using the below command in the terminal.
sudo apt-get update
sudo apt-get install skype
Type “y” when you promted, That’s it.
To Open Skype
Click Dash Home / window button on the Unity and type “s”, you will get a list of application. From the list select skype. Check the screenshot below.
Now Skype is installed and ready to launch on your system.
You are Opening Skype for first time and you need to agree the Terms of Use.
now you can add your account to it and use it.
Basics 