Public bug reported:

Binary package hint: grub2

I got 3 partitions, one for /boot, and other two for systems
/dev/sda1 is the /boot
/dev/sda2 is the /root_for_karmic
/dev/sda3 is the /root_for_lucid

When I do update-grub, it asigns the same root UUID to all of the systems be 
there a /dev/sda2 or a /dev/sda3
Below is the grub.cfg portion:
---

### BEGIN /etc/grub.d/30_os-prober ###
menuentry "Ubuntu, Linux 2.6.32-18-generic (on /dev/sda3)" {
        insmod ext2
        set root=(hd0,1)
        search --no-floppy --fs-uuid --set fff54eca-2280-47c1-9b5e-1d11eb161530
        linux /vmlinuz-2.6.32-18-generic 
root=UUID=37cc7add-ebf3-4f24-b6f0-f4b6bb6778d9 ro splash quiet
        initrd /initrd.img-2.6.32-18-generic
}
menuentry "Ubuntu, Linux 2.6.32-18-generic (recovery mode) (on /dev/sda3)" {
        insmod ext2
        set root=(hd0,1)
        search --no-floppy --fs-uuid --set fff54eca-2280-47c1-9b5e-1d11eb161530
        linux /vmlinuz-2.6.32-18-generic 
root=UUID=37cc7add-ebf3-4f24-b6f0-f4b6bb6778d9 ro single
        initrd /initrd.img-2.6.32-18-generic
}
menuentry "Ubuntu, Linux 2.6.31-20-generic (on /dev/sda3)" {
        insmod ext2
        set root=(hd0,1)
        search --no-floppy --fs-uuid --set fff54eca-2280-47c1-9b5e-1d11eb161530
        linux /vmlinuz-2.6.31-20-generic 
root=UUID=37cc7add-ebf3-4f24-b6f0-f4b6bb6778d9 ro splash quiet
        initrd /initrd.img-2.6.31-20-generic
}
menuentry "Ubuntu, Linux 2.6.31-20-generic (recovery mode) (on /dev/sda3)" {
        insmod ext2
        set root=(hd0,1)
        search --no-floppy --fs-uuid --set fff54eca-2280-47c1-9b5e-1d11eb161530
        linux /vmlinuz-2.6.31-20-generic 
root=UUID=37cc7add-ebf3-4f24-b6f0-f4b6bb6778d9 ro single
        initrd /initrd.img-2.6.31-20-generic
}
### END /etc/grub.d/30_os-prober ###
---

Here's an fdisk -l output:
---
r...@rivalry:~ ~# fdisk -l

Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x62f2a7cc

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1         122      979933+  83  Linux
/dev/sda2             123        1228     8883945   83  Linux
/dev/sda3            1229        2444     9767520   83  Linux
/dev/sda4            2445       30401   224564571+   5  Extended
/dev/sda5            2445        2930     3903763+  82  Linux swap / Solaris
/dev/sda6            2931       30401   220660776   83  Linux
---

I was using today's build of lucid-desktop.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

-- 
lucid update-grub wrong root=UUID=
https://bugs.launchpad.net/bugs/551790
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