Shutter is a feature-rich screenshot program.
I was trying to take screenshots of a whole web page. Shutter says it cannot
take screenshots of a web page until
gnome-web-photo is installed.
gnome-web-photo and Shutter still can’t take screenshots of web
pages, but I can use
gnome-web-photo to do that now:
gnome-web-photo https://mysite.co.uk/attractions/ attractions.jpg