I have a HP Envy 17 3d Notebook on which I installed Ubuntu 13.04 today (replaced the Windows 7 at installation). After Ubuntu installation, I started downloading & installing software from Ubuntu Software Center. I couldn't find Skype in Ubuntu Software Center, so I went to Skype.com and started downloading from there. After downloading, it showed up in Ubuntu Software Center and I clicked install. After some time the Skype icon shows up in Dash, but the application doesn't launch.
Please help me. I'm new to Ubuntu.