Shutter is a feature-rich screenshot program to take a screenshot of a specific area, window, your whole screen, or even of a website.
To install shutter on ubuntu 12.04
1.Open ubuntu software center. To open ubuntu software center click the Dash home from unity launcher. And type ubuntu software center in the search field. Then click ubuntu software center.
2.Type shutter in the search box.
3.Select shutter and click install button.
4.Type your ubuntu password if needed.
5.After the successful installation click the Dash home from unity launcher.And type shutter in the search field.Then click shutter.