I changed the default color of GDM on Ubuntu 17.10 to grey, changed the plymouth theme to spinner from plymouth-themes, and changed the grub background to my liking.
Still, after I type my password in GDM, when the system goes to the desktop, for a second I see purple colored display. How can I change that background?
Best Answer
What you have is the default desktop color showing while your wallpaper is loaded.
You should be able to change the desktop color in the control panel.