Apparently, other people are experiencing that pictures or photos outside of the Picture folder are not being displayed in LightDM.
Here is a quote from odysseusjak: "After playing with this, I found that the image has to be in the "Pictures" folder and not in a sub folder. I have a "Wallpapers" folder within my "Pictures" folder. If i selected an image in the "Wallpapers" folder, it would not show up on log in."
Here is a related discussion at UbuntuForums: http:// ubuntuforums. org/showthread. php?t=1952241
Apparently, other people are experiencing that pictures or photos outside of the Picture folder are not being displayed in LightDM.
Here is a quote from odysseusjak: "After playing with this, I found that the image has to be in the "Pictures" folder and not in a sub folder. I have a "Wallpapers" folder within my "Pictures" folder. If i selected an image in the "Wallpapers" folder, it would not show up on log in."