Screen brightness - Night Mode

Solution 1:

Redshift is easy to install, and even easier to use. Just open a terminal and do sudo apt-get install redshift redshift-gtk. Once the installation is complete, click the Dash icon, type 'red' (without quotes), and click the Redshift icon. The software does the rest. Here is a link to a page with a very good introduction to redshift. (not my work) http://jonls.dk/redshift/

Solution 2:

You should've tried f.lux, a tool that will change the color temperature of your computer’s display depending on the time of day. Quote from f.lux page:

f.lux makes your computer screen look like the room you're in, all the time. When the sun sets, it makes your computer look like your indoor lights. In the morning, it makes things look like sunlight again.

Tell f.lux what kind of lighting you have, and where you live. Then forget about it. f.lux will do the rest, automatically.

To install flux, press Ctrl+Alt+T to launch terminal and type:

sudo add-apt-repository ppa:nathan-renniewaldock/flux
sudo apt-get update
sudo apt-get install fluxgui

If you don't want add ppa, but prefer .deb file:

wget https://launchpad.net/~nathan-renniewaldock/+archive/ubuntu/flux/+files/fluxgui_1.1.9~20161125-g43350e0-1~xenial_all.deb
sudo apt install ~/Downloads/fluxgui_1.1.9~20161125-g43350e0-1~xenial_all.deb

Note: f.lux require your location to retrieve Latitude and Longitude, so make sure fill them (longitude is optional) to get it work.