I mean, why not, right?
The built-in screen capture software in Ubuntu is pretty good. Hit a button (Print Screen) and it snaps your screen into the copy buffer. Then you save it as an image file though a simple dialog.
But, and this happened to me recently, you may find need to capture something like a menu which doesn’t like to stay put while you press the appropriate button. Fortunately there is a way to work with this.
Take a look at the manual page for the Gnome screen shot application:
Apparently you can add border effects. Who knew?
Anyway, for my interests the one to know is the -d or –delay= argument. This allows you to hit Enter, mouse to the menu, and hover over the item of interest before you screen shot fires.
Try five seconds:
gnome-screenshot -d 5
Pew pew pew!