Comment 2 for bug 1372157

I have this bug too on my 14.04.1 LTS, login does not show my wallpaper as it should, it shows default Ubuntu wallpaper, lockscreen correctly shows my wallpaper but login does not, it is a fresh installation and fully updated.

lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty

apt-cache policy unity-greeter
unity-greeter:
  Installed: 14.04.10-0ubuntu1
  Candidate: 14.04.10-0ubuntu1
  Version table:
 *** 14.04.10-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     14.04.9-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

dpkg -l | grep unity-greeter
ii unity-greeter 14.04.10-0ubuntu1 amd64 Unity Greeter

dpkg -l | grep lightdm
ii liblightdm-gobject-1-0 1.10.1-0ubuntu1 amd64 LightDM GObject client library
ii lightdm 1.10.1-0ubuntu1 amd64 Display Manager