To install Shutter on Linux (Mint 18) with working screenshot editing extension, you must execute the following command. It will install the required packages via the Ubuntu package manager, which are needed for the screenshot editing extension.
sudo apt install shutter libgoo-canvas-perl gnome-web-photo
Then "restart" your computer. Afterwards Shutter looks like in the attached screenshot. Of course it will be in your operating system language. Mine is German.
Happy screen photographing! (: