Comment 12 for bug 946674

HelloMichael,
Reading your comment explaining something was related to background, I remembered that I try a tweak to personnalize the background of lightdm.
below what I done previously
cd /usr/share/backgrounds
sudo cp LinuxGreen.png warty-final-ubuntu.png

And whith this picture I worked well until an upgrade where I face the infernal loop of lightdm with unity-greeter crash.

Since then I uses gdm.
Today I simply
sudo rm warty-final-ubuntu.png
sudo dpkg-reconfigure lightdm

And up to now I am able to login using lightdm.

So I believe there is a track for this bug, maybe it affects people which played with the lightdm background