Tutorial on how to Install For Purchase Applications through Ubuntu Software Centre in Ubuntu 12.04. All you need is an Ubuntu One Account, which you can easily sign up for. Once you have purchased an application and its linked to your Ubuntu One Account you can install it on other computers, and you can also reinstall it when you upgrade Ubuntu. Apps can be purchased via Credit Card, Debit Card, or Paypal. Wallpaper: http://imgur.com/E4BVS