Could you also run:
"dbus-send --print-reply --system --dest="org.freedesktop.Accounts" /org/freedesktop/Accounts/User1000 org.freedesktop.DBus.Properties.Get string:"org.freedesktop.Accounts.User" string:"BackgroundFile""
when "1000" is your user uid
Could you also run:
"dbus-send --print-reply --system --dest= "org.freedeskto p.Accounts" /org/freedeskto p/Accounts/ User1000 org.freedesktop .DBus.Propertie s.Get string: "org.freedeskto p.Accounts. User" string: "BackgroundFile ""
when "1000" is your user uid