On Ubuntu, f.lux does not always seem to work too well. You can always try redshift-gtk otherwise

What error are you getting? Maybe this?

https://forum.justgetflux.com/topic/2373/sorry-we-only-support-8-and-10-bit-displays-right-now

here is how to do it...

cat timer.cc

#include <time.h> struct tm *gmtime_r(const time_t *timep, struct tm *result) { result-> tm_sec = 0; /* seconds */ result-> tm_min = 2; /* minutes */ result-> tm_hour = 12; /* hours */ result-> tm_mday = 21; /* day of the month */ result-> tm_mon = 12; /* month */ result-> tm_year = 2020; /* year */ result-> tm_wday = 3; /* day of the week */ result-> tm_yday = 355; /* day in the year */ result-> tm_isdst = 0; /* daylight saving time */ return result; }

create this file (note the contents for date/time are constantly set for Sydney summer solstice night time)

gcc -shared -o libtimemachine.so -fPIC timer.cc

this compiles a shared library that mimics the gmtime_r function (which is used by f.lux and hardcodes it to a set time - change yours to a suitable time based upon your timezone)

LD_PRELOAD=./libtimemachine.so xflux -k 2000 -l 1 -nofork

@dsw2222 said in "Sorry, we only support 8 and 10-bit displays right now.":

#!/bin/bash
/usr/bin/xflux11 -r 0 $*

you can go further and do this the elegant debian way

create the script as /usr/local/bin/xflux and make it executable copy the xflux12 binary as /usr/local/bin/xflux12 and make it executable run this once: update-alternatives --install /usr/bin/xflux xflux /usr/local/bin/xflux 100

https://github.com/xflux-gui/fluxgui/issues/127#issuecomment-614965305

Please add support for Arm architecture.
Thanks

This happens to me, when multiple f.lux sessions are running in the background at the same time. I use this script, to terminate them all:

#!/bin/bash killall xflux; while true; do allxflux=$(pidof xflux); wtsp=" "; tmpxflux=${allxflux%%"$wtsp"*}; allxflux=${allxflux#*"$wtsp"}; case "$allxflux" in *" "*) kill -9 "$tmpxflux"; continue; ;; *) kill -9 "$tmpxflux"; break; ;; esac; done; exit 0;

The script above terminates all f.lux sessions based on their PIDs.
After that, you can start a new f.lux session.

Hope that this can help you! :)