Background was stuck on "Vanishing_by...." set in 12.10 some time ago. After upgrade noticed that the unity-greeter version of the background (i.e. with password box) transferred to desktop background (i.e. it had the password box). Was not possible to set another background via system-settings. Using dconf -editor I got it to disappear from the desktop but not the greeter; desktop however now blank.
:~$ ls -al /usr/share/
drwxr-xr-x 3 root root 4096 mar 8 01:55 backgrounds
:~$ gsettings get org.gnome. desktop. background picture-uri //usr/share/ backgrounds/ warty-final- ubuntu. png'
'file:/
:~$ 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 "
method return sender=:1.77 -> dest=:1.188 reply_serial=2 variant string "/usr/share/ backgrounds/ Vanishing_ by_James_ Wilson. jpg"
Background was stuck on "Vanishing_by...." set in 12.10 some time ago. After upgrade noticed that the unity-greeter version of the background (i.e. with password box) transferred to desktop background (i.e. it had the password box). Was not possible to set another background via system-settings. Using dconf -editor I got it to disappear from the desktop but not the greeter; desktop however now blank.