I am using the same background image for both my GDM background and my gnome wallpaper. However, when I log in, I see a purple splash. I have no clue where this splash comes from.
Where does this splash come from and how to I get rid of it?
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I had the same issue and tried several things but none of them did the trick.
I finally got rid of the purple flash by installing
gnome-session and using GNOME as the default
sudo apt-get install gnome-session
The procedure is described in more detail in this thread (for 17.10) https://ubuntuforums.org/showthread.php?t=2383902