There is something really wierd going on, I installer lightdm and configured it as per instructions in the getting started guide. However, when I reboot the usual XFCE desktop comes up but behind it is the login screen. I can access it through a "hole" in the wallpaper, and if I log in I have two identical desktops running, slightly misaligned.
So it looks to me that the XFCE desktop startup is hardcoded somewhere or the startup script is not placed the usual place where the config script(s) can modify it. I'd like to know where the scripts that starts all the madness is located so I can edit them, or if there is another way to get rid of the initial desktop that overlays everything else. I also tried to install MATE and it ends up under the top desktop.