Normally, I hit my "Print Screen" key, and this wonderful thing appears. However, I have no such luck in fullscreen programs. Nothing happens. No wonderful little screenshot helper, no clipboard content.
How can I take screenshots of fullscreen programs?
There's more than one way to skin a cat.
In your application launcher, you should have this guy:
Turns out, he has a delay setting:
It's not ideal, but you can open this, set a sufficient delay, open your program, and when the time comes, it will successfully take a (fullscreen) screenshot of a fullscreen program.
It's simple
Try any command line tool , like scrot , in case when you're unable to switch out of that application , like DOOM3 , which grab X11 totally
e.g delay 10 seconds for a screenshot
or continuous screenshot using a bash script:
That's how i made a walk-through for Doom3 in Linux ;-P