After I upgraded Ubuntu from 16.04 to 18.04 on my laptop tonight, the display is tuned by yellow. It is hard to see things clearly. I have searched the web and also tried adjusting the RGB values from both hardware and software settings, but I ran out of luck. When I boot the laptop into the Windows 10 system on the other partition, the color on display is normal. Can someone please shed some light for how to fix it?