Well, it’s really a shame that such a tool is slowly fading into Debian’s oldstable and oldoldstable.
Then I found why: it’s written in Perl which is a perfectly good programming language but it is currently considered too “old-fashioned”. It is also “stuck” using the old Gnome 2 libraries and it shows all its aging. You may say that software does not “age” and you are right. I expected it would install a lot of old libraries so I tried to issue
sudo apt install shutter on my Debian box just to see how many packages it would have pulled. It failed. Oh, my. I can resign myself to use the simpler Gnome 3 screenshot tool.