Ksnapshot is a tool that comes with the KDE integrated desktop environment, but it can also be installed and used in the GNOME Integrated desktop environment. You can use the Apt-get command to install it. Suppose you use the command line to install, open a Gnome terminal window and enter the following command in the terminal window:
1) After the sudo apt-get install ksnapshot command executes, the ksnapshot will be downloaded and installed online. After installation, find the "Ksnapshot" item under the menu "application" → "image" and you can use this powerful screenshot software.
2) The Ksnapshot feature is very powerful and offers the following modes:
Fullscreen (full screen)
The form under the cursor (Window under Cursor)
Anywhere (region) and
Form parts (section of Window) four
Where the form under cursor crawl mode can crawl the form without activating the form you want to crawl, as long as you move the mouse to an area of the form. Ksnapshot adds the ability to copy to the Clipboard and print directly in the output of the captured image. Ksnapshot should be considered to be a more professional capture tool, using ksnapshot can almost easily grab any image on the screen
Ubuntu System use 6: Screenshot software Ksnapshot