I have been using Ubuntu 10.04 on my HP notebook for more than two years, and I have just installed Ubuntu 12.04 on Mac Pro.
The problem of taking screenshots on a Mac is that there is no PrintScreen Key. So how can I take screenshots?
Ubuntu – Taking screenshots with Mac keyboard
macscreenshot
Related Solutions
Shutter has an option to automatically save screenshots, incrementing the filename each time.
Edit ➜ Preferences ➜ Main ➜ Save :
To make Shutter take the screenshots when you hit PrtScr,
go to Edit ➜ Preferences ➜ Keyboard and check the Capture checkbox:
If you don't want the Shutter window to pop up every time you take a screenshot, go to Edit ➜ Preferences ➜ Behavior and uncheck Present main window after taking a screenshot :
Using Shutter 
- First go to Edit -> Preferences and tick the two options mentioned below .
- Now Take the screenshot of a window and right-click and select run a plugin .
- Now select Hard Shadow and run it .
- Your Final Screenshot will look like this .
Using gnome-screenshot
- Launch 'Take Screenshot' from the dash and select 'Include the window border' with the Effect Drop 'Shadow' or 'Border' and then take the screenshot.
To do the same using the terminal ( Ctrl + Alt + T ) paste
gnome-screenshot -w -b -d 5 -e border
where 5 is delay in seconds and border can be replaced with shadow for 'Drop Shadow' .
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Best Answer
Open the dash and type "screenshot" you'll be prompted with an app, with a photo camera icon, that will let you take different types of screenshots. You can grab the whole desktop or grab the current window or Select an area to grab.
While that app is open right click on it's icon in the launcher and select "lock to Launcher" to keep it there.