How to set gtk-style and background in GDM3

This has something to do with Xauth.... Actually running

xhost +SI:localuser:gdm

as root (or as admin account) let gdm accept gsettings set commands

Actually the solution for setting gtk-theme or background is

gsettings set org.gnome.desktop.interface gtk-theme GTK3_THEME

gsettings set org.gnome.desktop.interface icon-theme ICON_THEME

gsettings set org.gnome.desktop.interface cursor-theme CURSOR_THEME

gsettings set org.gnome.desktop.background picture-uri 'file://FILE'

for example:

gsettings set org.gnome.desktop.background picture-uri 'file:////usr/share/backgrounds/JardinPolar_by_CarmenGloria_Gonzalez.jpg'

Another important thing to check is that gdm has rw permissions to its home folder, i.e. /var/lib/gdm

!!!IMPORTANT!!! exit to exit from being logged in as gdm followed by

xhost -SI:localuser:gdm as root or admin user after setting above parameters to deny access to gdm (otherwise it may create problems)

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