maple classic™ 
xubuntu used to show my user's wallpaper in lightdm but now it doesn't anymore and that's the kind of inconsequential bug no linux maintainer cares about and you can't find any fix for online and that really upsets me because i really liked having my wallpaper be the first thing i see logging in
@squirrel permissions problem maybe?
The wallpaper has to be accessible to the lightdm user
@troubleMoney it used to be and then wasn't anymore when i installed fprintd for fingerprints
@troubleMoney meanwhile wallpaper didn't change
@squirrel damn, like 50% of the time on linux the problem is permissions
@squirrel didn't switch the greeter by any chance while doing the fprintd stuff?
Also, are you setting the wallpaper manually or automatically from your user wallpaper?
@troubleMoney uhh it's one of the wallpapers that comes with xubuntu
and i don't know what a greeter is
@squirrel ah, lightdm is the bit that does display managing, the greeter is the bit that pops up and actually asks you for the username and password
wallpapers are handled by the greeter, so if you changed that you might need to set the wallpaper
@troubleMoney i didn't change anything other than install fprintd, which added a thing in lightdm that asks me for my fingerprint on top of regular password
i don't know what greeter lightdm has?
@troubleMoney hhhh blrg
does it help to know that changing to "guest" and then back to my user makes the wallpaper fade in
like, the greeter already knows it
it's just not ..... putting it on by default anymore
@squirrel I have no idea why it's doing that, but setting the wallpaper manually will make it put that wallpaper there
@squirrel from what I can tell xubuntu uses lightdm gtk greeter as default
If you want to set the wallpaper manually on that the setting's in /etc/lightdm/lightdm-gtk-greeter.conf
It's the "background" variable in the [greeter] section
Not sure if that'd actually help, but might be worth a try