[Ж.Д.А.Л.К.Е.Р.]

Наверное так (я убунтой не пользуюсь):

title Try Ubuntu without installing map /ubuntu-10.10-desktop-i386.iso (0xff) map --hook root (0xff) kernel /casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper iso-scan/filename=/ubuntu-10.10-desktop-i386.iso quiet splash -- initrd /casper/initrd.lz