Ubuntu Developers Portal

http://developer.ubuntu.com/

Easy as pie and a major step in the right direction.

Install Quickly (contains PyGTK)

We recommend using PyGTK to create applications for Ubuntu. Quickly will get you up and running with a PyGTK app right away.

Take 5 minutes to get to know Quickly

With Quickly installed, click Applications > Accessories > Terminal and create a new project by typing:
$ quickly create ubuntu-application my-new-project

You should replace my-new-project with the name of your application. This will create the new project in a directory called my-new-project/.

Now start reading the Quickly tutorial by going into the project directory (cd my-name-project) you just created and running:

Write your app

At the heart of the Ubuntu Developer stack is a range of technologies that meet the most diverse range of application needs. Each is powerful, robust, well supported and shipped with every Ubuntu system, providing a reliable development platform for the most demanding application.

Prepare for publishing