I've using Ubuntu 12.04 for a month, and i have problem with shutter when i want take the screenshot of my desktop. I've set shutter as default for taking screenshot like on my last ubuntu distribution but it's not work. There is how to set shutter as default form shutter website, it's not work on my machine.
Iam trying to use dconf editor, gconf editor and other, but i can't find the answer how to set shutter as default. When i asking my friend, i got the answer and the solution to set shutter as default. There is step by step set shutter as default screenshot tool. It will be replacing gnome-screenshot shortcut.

• You must install shutter on machine. Open shutter and go to preferences and open keyboard tab. Set shutter key for taking screenshot (I think it's not important because we will using command like this feature).

shutter preferences as default

• Open system settings, select keyboard menu. Open shortcut tab and then select Custom shortcut. Adding new command with pressing ( + ). Give command name as you like but you must enter command with shutter -f. It's command for taking full window screenshot with shutter.

set shorcut for shutter taking screenshot

• Set the disable key and change it with print button or other. If you using print button, it will replacing gnome-screenshot key. So you will using shutter for taking screenshot.