Autostart on Ubuntu 12.10

I have tried every method I can find to get XBMC to autostart but still can't get it working.

I tried changing /etc/X11/default-display-manager but just got a black screen.

Anyone got this working?

This method: http://forum.xbmc.org/showthread.php?tid=38473

i get stuck at this step:

Install rcconf:
Code:
sudo apt-get install rcconf

I get :

rcconf needs dialog or whiptail.