▻https://www.linuxuprising.com/2020/10/shutter-screenshot-tool-ppa-updated-for.html
Install Shutter on Ubuntu 20.10 (or Ubuntu 20.04 / 18.04 / Linux Mint 20 or 19.x), as well as Linux distributions based on Ubuntu, such as Pop!_OS using the following commands in a terminal:
sudo add-apt-repository ppa:linuxuprising/shutter
sudo apt-get update
sudo apt install shutter