I believe that the calibration is supposed to be done with a colorimeter and the button is grayed out because there's no colorimeters connected:
https://help.ubuntu.com/stable/ubuntu-help/color-calibrationdevices.html
I believe that the calibration is supposed to be done with a colorimeter and the button is grayed out because there's no colorimeters connected:
https:/ /help.ubuntu. com/stable/ ubuntu- help/color- calibrationdevi ces.html