I am using Ubuntu 16.04. Ubuntu ships with some
gnome-screenshot, which can take screenshots of both the entire screen and screen parts. Unfortunately, it doesn't work if some menu is activated, i.e. I can't take a screenshot of a dropdown menu. In other cases the menu is closed when I press Shift+PrtScn.
This is an imperfection which Greenshot does not have.
Is there a normal screenshot application in Ubuntu which can capture everything, including menus?