I have fallowed this guide to create a kickstart file to install ubuntu automatically. However the problem is that when I boot the menu item

label autoinstall
  menu label ^Auto install
  kernel /casper/vmlinuz
  append  file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz file=/cdrom/ks.cfg --

it doesn't start the installer. I've tried using automatic-ubiquity as one of the parameters, but still it seems that kickstart file isn't used.

Is there a way to make this work, or is there another way (preferably without using network, like FAI).