I don't know if it matters to you now, but as you can see on this Reddit thread the issue is that both f.lux and Chrome depend on a few libraries in common. If you try to install 32-bit Chrome, then there's a conflict since 64-bit f.lux wants the 64-bit versions of those libraries. If you install 64-bit Chrome there should be no problem.

@echoRo Please search this forum. There has been at least 2-3 threads on this now, and I don't want to duplicate effort, also it's been quite some time since I've used f.lux on Linux.

Can you recommend a different tool? On my MacBook and my Windows PC f.lux is a real helpful tool to me, is there anything comparable to it which would get me the slow transition? I don't even wanna think about running Wine on my machine.

Just wondering if anyone managed to solve this? I'm on Ubuntu 14.04 and I have the same issue.

If not, is there a way to set xflux to transition gradually on the command line? It doesn't have a man page and I can't find a list of parameters anywhere.

Ah there's a topic about this. :D
I have been doing my own research but I didn't know there was a topic about this haha.
Really fascinating how the whole thing started and what it is today. You should be proud! :D

After trying to remove flux-gui through the terminal, I get the notice that the command/file is not found. Trying to ruin xlfux and flux-gui result in the terminal telling me that neither are installed. Somehow xflux was removed when I installed flux-gui.

A user in GitHub has a new repository and it works with my Ubuntu 15.10

Try the xflux that is much newer, at the bottom of page.

Yeah, there is a fix in one of the linux threads. The devs don't need to really update at the moment, they're very busy.

The answer is on the downloads page

A 64-bit version with multiple monitor support is available here: xflux64.tgz
https://justgetflux.com/linux/xflux64.tgz

It's not available yet but we'd love to offer it. Hopefully Windows Phone will offer some better color management options in the future.