Custom LiveCD without Unity still tries to load ubuntu session. (Failed to load session "ubuntu")

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http://askubuntu.com – I'm trying to create my own Ubuntu LiveCD without Unity. When lightdm loads is says (Failed to load session "ubuntu"). The autologin fails and then lightdm reloads with a normal login screen. I can login fine with ubuntu user and if I run "sudo x-session-manager" I still get the error message (Failed to load session "ubuntu"). But that's as far as I can pin point where the problem is. Where is the default session manager setting? Lightdm config /etc/lightdm/lightdm.conf says that autologin-session=lightdm-autologin but I'm not sure what that is. Trying to edit this config wouldn't hel (HowTos)