How can I disable the shutter sound of gnome-screenshot?

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http://unix.stackexchange.com – After a recent update of my LMDE, the gnome-screenshot tool started making an annoying camera shutter noise every time a screenshot is taken. This is both annoying and startling (especially if you happen to be wearing earphones when taking the screenshot). I checked the man page of gnome-screenshot` but there were no relevant options. How can I take silent screenshots? (HowTos)