Install kde-spectacle by entering the following commands in the terminal:
sudo apt update sudo apt install kde-spectacle
Description:
Screenshot capture utility, replaces KSnapshot
Spectacle captures images of the screen. It can capture the whole screen, a specified region, an individual window, or only part of a window.
Homepage: https://projects.kde.org/projects/kde/kdegraphics/spectacle
Version: 17.12.3-0ubuntu1
Section: universe/graphics