Redshift is a program that gives your computer screen a dimmer brightness, and indeed a more red hue, at night.
It fails silently on most non-Ubuntu Debian systems. Well, it seems like a silent fail or crash if you don't run the command in the terminal. If you do run the command gtk-redshift in the terminal, the output is perfectly comprehensible:
Initialization of gnome-clock failed.
Trying next provider...
Latitude and longitude must be set.
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