Screengrab is not set to launch with the obvious keybinding of PrtSc in 19.10. Not a big issue, but maybe something to fix for the LTS? It confused me into thinking there was no screengrabbing utility for a while...
Actually @EinarMostad it seems this is not an issue at all. I was remembering T84: Change default screenshot utility to screengrab from lximage-qt. and thinking we had failed to take care of the shortcut but it seems that's not the case:
[Print.29] Comment=screen shot Enabled=true Exec=screengrab