In Xubuntu 18.04 I had some problems with the functioning of f.lux, so I migrated to Redshift. These are software which adjusts the color temperature of your screen in order to prevent eye strain during night-time use and reduce disruption of sleep patterns. In this short article I show you how to install and setup it.
I have recently started to complain some eye strain and headache, after remaining many hours in front of my laptop screen. Hence I discovered the 20-20-20 rule and wrote a script in Python to automatic show a black fullscreen every 20 minutes for 20 seconds in order to force me to look away at something that is 20 feet (about 6,10 meters) from me. Besides the program makes a sound when the screen turns on again.