Bug#598182: This bug persist on v30

[Jose Luis Zabalza <jlz.3008@gmail.com>]

I guess these problems are the same.

With these entries on syslinux cfg on a USB Live Debian image

- the first install from live rootfs image and boot OK (live-installer runs OK)
- the second install succesfull but don't boot (don't find rootfs in hd)
- third install and boot but from live rootfs too.


label Success
        menu label Success
        kernel /install/vmlinuz
        append initrd=/install/initrd.gz auto=true priority=critical
vga=normal quiet  file=/cdrom/install/preseed.cfg

label Error1
        menu label Error 1
        kernel /install/vmlinuz
        append initrd=/install/initrd.gz auto=true priority=critical
live-installer/mode=live vga=normal quiet
file=/cdrom/install/preseed.cfg

label Error2
        menu label Error 2
        kernel /install/vmlinuz
        append initrd=/install/initrd.gz auto=true priority=critical
live-installer/enable=false vga=normal quiet
file=/cdrom/install/preseed.cfg