Package: debian-cd Version: 3.1.1 debian-cd/tools/boot/lenny/boot-x86 states at line 59 INSTALLDIR_i386="install.386" but isolinux (dists/lenny/main/installer-i386/current/images/cdrom/debian-cd_info.tar.gz) is set up to boot the kernel from /install, so the generated CD can't boot. Replacing install.386 by install solved this issue for me.