Snipping tool in ubuntu 16.04

No need to install any other app or repo, just go with the defaults. Thank God for Ubuntu 16.04, it tries to get everything to work for users. Hold down the Shift + PrtScn keys together.

Your mouse will change to a cross-like pointer. Hold down your left-click key on the mouse and drag. It saves screenshot image to Pictures directory. To copy to Clipboard, use Ctrl> + Shift + PrtScn. Have fun.

This uses gnome-screenshot under the hood. You can change the keyboard shortcut via the regular keyboard settings.

Have a look at Screenshot. You can find it in Ubuntu Software.

http://apt.ubuntu.com/p/gnome-screenshot

Good luck!

There is no need to install any apps. By default, the Screenshot app is installed in Ubuntu 16.04. Just go to Accessories, and in Accessories find Screenshot.