Here is the small tutorial about installing Skype on Ubuntu 13.04.
Open terminal ( Ctrl + Alt + T).
Install dependencies.
sudo apt-get install libxss1 pulseaudio libqt4-webkit
wget http://download.skype.com/linux/skype-ubuntu-lucid_4.1.0.20-1_i386.deb
Install Skype.
sudo dpkg -i skype-ubuntu-lucid_4.1.0.20-1_i386.deb
Start Skype:
Start Skype from Menu ( Menu—-> Internet —-> Skype ).
or
raj@itzgeek:~$ skype
Accept License Agreement.
Login with user name and password.
That’s All.