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Trouble installing f.lux

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http://crunchbang.org – Hello,I've run into trouble installing the program f.lux, which changes the warmth of the display at night to relieve the eyes.Here's what I tried:1.sudo add-apt-repository ppa:kilian/f.luxI get an error saying that add-apt-repository is not found, and the common solution of installing the package python-software-properties didn't work for me, as the package is already installed.2. I downloaded xlufx.tgz, and followed the instructions in this post to move the file to /usr/local/bin. But whenever I try to use the command xflux or flux, it's not found. Yes, /usr/local/bin is (HowTos)