Skype

#Step 1: Remove previous version.

sudo apt-get remove skype skype-bin:i386 skype:i386
sudo apt-get install sni-qt:i386


#It is Important if you installed older version of Skype on your Ubuntu, Clear the old Skype folder before installing latest version. Then clear that by using:

rm -rf ~/.Skype

#Step 2: Preparing to Installing Skype.

#Users of 64-bit Ubuntu, should enable MultiArch if it isn't already enabled by running the command
sudo dpkg --add-architecture i386
#Update repositories and "updates" list:
sudo apt-get update
#Optional, install GDebi (see below):
sudo apt-get install gdebi #(read Why you need to install gdebi...)

#Step 3: Installing Skype

#Method 1: Download and install from file

wget download.skype.com/linux/skype-ubuntu-precise_4.3.0.37-1_i386.deb
sudo gdebi skype-ubuntu-precise_4.3.0.37-1_i386.deb

#Method 2: Install Skype from Canonical Partner Repository

#So add the Canonical Partner Repository to "updates" list by following the command:

sudo add-apt-repository "deb http://archive.canonical.com/ $(lsb_release -sc) partner"
#Then install Skype via the Software-Center or via the Terminal.

sudo apt-get update && sudo apt-get install skype