I have tried out several solution of this problem described on other posts
Making a guest account, checking localization, trying red shift, turning on and off computer Killing the process of night light before running red shift Playing with manual, time, automatic one screen, two screen starting over again reinstalling Gnome Still night light will not work (neither red shift)
My screen wont change color
I used it before on another version of ubuntu and it used to work fine I badly need this option because I draw on a wacom one and my eyes are suffering.