[ Thanks to Femi
for this link. ]
“The shutter website hosts a step by step installation
tutorial for graphical installation on Ubuntu. If you are oriented
towards command line, follow these steps“1) Import the GPG key
$ sudo wget -q http://shutter-project.org/shutter-ppa.key -O- | sudo apt-key add -“2) Add the PPA repository— to /etc/apt/sources.list”