Thanks a lot John VV your advice works I try both ways, but all the time was without success, gtk was the key, and I followed your recommendation. I looked on my old notes and I find the installation of Redshift for Ubuntu and this is from "Itouchmap.com/latlon.html
sudo apt-get install gtk-redshift
gtk-redshift -l52.25:6.15 -t6500:3700
But today doesn't work anymore and this what I readed after the start from redshift from the icon:
GDBus.Error
rg.freedesktop.DBus.Error.AccessDenied: Geolocation disabled for UID 1000.
Unable to connect to GeoClue.
error to try the location from the server or something like that, maybe I look by org.freedesktop or itouchmap.com about redshift
and I try a lot of times and no work anymore, maybe tomorrow I can try another time today is late and I don't think anymore clear, but I think first uninstall and after install another time with your instructions. Very friendly your effort to help me, thanks a lot. Gil