How to install skype in Ubuntu from skype repository

Skype is proprietary software that allows you to make calls over the Internet using your computer. Skype uses decentralized peer-to-peer technologies, so your calls do not go through a central server, but through distributed servers and other users. It uses its own proprietary communication protocol to achieve this. In addition, all communications are encrypted from end to end so that others cannot listen in. The Skype software is free to use, but it is not free software; the source code is proprietary and not available for modification.
Install skype in Ubuntu

First you need to edit /etc/apt/sources.list file from your terminal

gksudo gedit /etc/apt/sources.list

Add the following line

deb http://download.skype.com/linux/repos/debian/ stable non-free

Save and exit the file

Now you need to install GPG key

sudo apt-key adv --keyserver pgp.mit.edu --recv-keys 0xd66b746e

Update source list

sudo aptitude update

Install skype using the following command

sudo aptitude install skype

Using this repository, you will automatically receive future updates to the software

To start Skype, choose Applications->Internet->Skype.