I'm what's called a windows xp refugee to Linux. I get a headache and mild insomnia without f.lux, and I asked on a Linux forum how to solve the problem, and so far I'm getting half answers / questions in language I don't understand. If you're willing to spend some time going step by step with me, I'd appreciate it very much. There's no rush.
I'm using a Dell 600 latitude and Linux Debian. If there's an easier version of Linux that you'd recommend, don't hesitate. I'm not even sure if I downloaded everything correctly.