I just add a key short cut. I'm using Alt + P to bring up the screenshot application.
https://gimcrack555.wixsite.com/mysite/ ... ortcut-key
Add Screenshot Shortcut key
I just wanted a quicker way to bring up the gnome-screenshot app. So I went to keyboard in Settings. Stroll to the bottom to click onto add(+). Name: Screenshot Command: gnome-screenshot --interactive Shortcut: Alt + p It work like a charm. None of the build-in Screenshot Shortcut keys didn't work for me. I couldn't change or delete those settings. So I made this one. It work's that's all that matters.