I recently installed Ubuntu GNOME 13.10 (it came with GNOME 3.8, but I replaced it by GNOME 3.10) and after a few problems, the only one I couldn't solve was the screenshot problem.
When I press the PrtSc key, nothing happens. No sound, no nothing. When I execute it via Terminal by writing "Gnome-Screenshot", it does work and saves a screenshot in my Pictures folder.
I have already tried to re-install the program, but still didn't work. I also tried to create a shortcut with this command line, but still nothing happened. I tried to replace the PrtSc key by another one, just for make sure the problem wasn't in the key, and it still failed.
Can anyone help me?