Here’s the simple installation guide on installing Skype for Linux in Ubuntu 12.04 64-bit. The official website points to wrong package format for 64-bit Ubuntu and it can be fixed by adding output parameter with wget command.

First install the dependencies by this command in a terminal window(or use Synaptic):

sudo apt-get install lsb-core ia32-libs libqt4-dbus libqt4-network libqt4-xml libasound2

sudo apt-get -f install

Then, download the 64 bit deb package from the official website by:

wget -O skype_Ubuntu-current_amd64.deb

Now, install skype:

sudo dpkg -i skype_Ubuntu-current_amd64.deb
sudo apt-get -f install