The print screen key has stopped working in my normal user (both built in and external keyboard). Until a week ago it was happily taking screenshots.
I know when it last worked (from Pictures directory) and don’t recall having installed anything since then. But I may be wrong.
It works fine in a different user on the same system.
Ubuntu 18.04
>Solution :
Check whether the screenshot tool is working properly. Open a terminal and issue the command
gnome-screenshot
A screenshot should be taken (you see the screen flashing) and the screenshot should be added in your Pictures folder.
If that works, then execute the following command to reset the keybinding for "Save a screenshot to Pictures" to the system default:
gsettings reset org.gnome.settings-daemon.plugins.media-keys screenshot
This should restore the function of the PrtScr to the factory default.