Hi @Dingo1213,
Chances are it starts up before something it needs - sometimes it does, sometimes it doesn’t. Adding a delay of just a few seconds will often take care of it.
You can see the startup entry in:
System -> Preferences -> Personal -> Startup Applications
Scrioll down and select Redshift then press Edit. In the Command Field it will say:
redshift-gtk
Change that to say exactly this:
/bin/sh -c "/bin/sleep 5; redshift-gtk &"
Then press Save.
I know… Startup apps are a royal pain to add a simple delay and I personally use a different technique. I know this delay works with 16.04 because I checked it. I added 5 seconds with sleep 5
but even as short as 1 second could help or you may have to increase to 10 seconds all depending on your system.
Any issues put back the original Command field. Does this help?