xfce4-screenshooter
Screenshots utility for Xfce
Allows you to capture the entire screen, the active window or a selected region. You can set the delay that elapses before the screenshot is taken and the action that will be done with the screenshot: save it to a PNG or JPG file, copy it to the clipboard, open it using another application, or host it on imgur, a free online image hosting service.
Screenshooter is an utility for the Xfce Desktop Environment. It can take desktop, rectangles or selected window screenshots, and you can bind it to your "Print Screen" key. A panel plugin is provided too.
How to install xfce4-screenshooter in Ubuntu
If you are on a supported distro, you can install the application through software center by clicking the below link.
If the above link not working, run the below command in terminal to install xfce4-screenshooter in Ubuntu
sudo apt install xfce4-screenshooter