Possible Duplicate:
Print Screen key doesn't work if a drop-down menu is active
As you know, by pushing PrintScreen button on the keyboard, a screen-shot of desktop will be saved on your home folder, but why it doesn't work when I open a menu?
For example, when I open LXDE menu and then pressing PrintScreen, nothing happen. Neither when menus such as File, Edit, View and etc. are open.
The quick way to take a screenshot on Lubuntu is simply hitting the PrtSc button. It saves your file to your home folder.
The software mentioned below, Kgrab, and Ksnapshot, bothe were installed from the Lubuntu Software Center. Meanwhile, mtPaint was available by default under the Graphics menu.
However, certain actions can't be captured using the PrtSc button. Sometimes a time delay is required in order to begin a specific function. I use Kgrab
or Ksnapshot
As you can see both have the options to choose full screen, wndows, etc.., and both have time delay.
You can use mtPaint. It comes default on Lubuntu. In the menu, there's a timedelayed screenshot option. Not as easy as the above, but it will do the job.
Use Shutter, it's something like Snipping tool on Win7.
sudo apt-get update
sudo apt-get install shutter
As you open it you have New - Selection / Desktop / Active window...
This is because pressing PrintScreen usually makes the menu go away. You can work around this by setting a delay before you take the screenshot. For instance, if you have imagemagick installed you can do the following on a terminal:
sleep 10; import -window root <filename>.png
