I remember back in the day if I had 3 accounts on my Ubuntu system and each had a different wallpaper I would see each wallpaper at the login screen (depending on which account was selected). Now in 18.04 I don't get that by default. As an added complication I run xplanet and it changes my wallpaper every 20 minutes.
How do I get the login screen to show my desktop wallpaper when my account is selected.
P.S. I checked many other "solutions" and they were either not for 18.04 or just plain didn't work. Also I recently installed 18.04 from a thumb drive (it's sparkly new).
Also I don't think I have gdm. I got this response from dpkg-reconfigure: /usr/sbin/dpkg-reconfigure: gdm is not installed Also: $ps ax gives me this output 958 tty1 Sl+ 0:00 /usr/lib/gnome-session/gnome-session-binary --autostart /usr/share/gdm/greeter/autostart I've installed lightdm, but all that did was get me the orange beaver background back.
Update: It seems there may be a security issue involved in having access to an account's walpaper before login. It seems this may have been blocked due to a security hole.