Bug#924631: os-probe failed to detect second debian

[张宁]

Package: os-probe
Version: 1.76~deb9u1

I rsynced debian to new partition, and run update-grub2. and reboot
and select new boot entry, but still go into old debian.

after check, I find new boot entry still old debian.

menuentry 'Debian GNU/Linux 9 (stretch) (on /dev/sdd2)' --class debian
--class gnu-linux --class gnu --class os $menuentry_id_option
'osprober-gnulinux-simple-ee7047da-04ee-40a9-8638-c9d67fb70557' {
    insmod part_gpt
    insmod ext2
    set root='hd3,gpt2'
    if [ x$feature_platform_search_hint = xy ]; then
      search --no-floppy --fs-uuid --set=root --hint-bios=hd3,gpt2
--hint-efi=hd3,gpt2 --hint-baremetal=ahci3,gpt2
ee7047da-04ee-40a9-8638-c9d67fb70557
    else
      search --no-floppy --fs-uuid --set=root
ee7047da-04ee-40a9-8638-c9d67fb70557
    fi
    linux /boot/vmlinuz-4.19.0-0.bpo.2-amd64
root=UUID=2acce490-481b-4f33-9dff-606a573cdc37 ro quiet nopti
    initrd /boot/initrd.img-4.19.0-0.bpo.2-amd64
}