Unable to find root in grub entry

[flebber]

I am trying to triple boot. I have a laptop with windows 7, ubuntu 12.04 and I want to have Sabayon KDE 10. I have installed Sabayon, during install i didn't install grub as I want to manage it from ubuntu.

After the install I rebooted into Ubuntu.

I ran vgchange to mount my lvm and the updated grub as below. The error I get though when attempting to use these grub entries on boot for Sabayon 10 is that it cannot find root and it drops me to a shell.

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sayth@sayth-TravelMate-5740G:~$ sudo vgchange -a y
  2 logical volume(s) in volume group "vg_sabayonx8664" now active


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sayth@sayth-TravelMate-5740G:~$ sudo update-grub2
Generating grub.cfg ...
using custom appearance settings
Found background image: /home/sayth/Pictures/Konachangrub.jpg
Found Windows 7 (loader) on /dev/sda1
Found Windows 7 (loader) on /dev/sda2
Found Windows 7 (loader) on /dev/sda3
Found Gentoo Base System release 2.2 on /dev/mapper/vg_sabayonx8664-lv_root
Found linux image: /boot/vmlinuz-3.2.0-30-generic
Found initrd image: /boot/initrd.img-3.2.0-30-generic
Found Windows 7 (loader) on /dev/sda1
Found Windows 7 (loader) on /dev/sda2
Found Windows 7 (loader) on /dev/sda3
Found Gentoo Base System release 2.2 on /dev/mapper/vg_sabayonx8664-lv_root
Found Windows 7 (loader) on /dev/sda1
Found Windows 7 (loader) on /dev/sda2
Found Windows 7 (loader) on /dev/sda3
Found Gentoo Base System release 2.2 on /dev/mapper/vg_sabayonx8664-lv_root
Found linux image: /boot/vmlinuz-3.2.0-30-generic
Found initrd image: /boot/initrd.img-3.2.0-30-generic
Found memtest86+ image: /boot/memtest86+.bin
done


This is my hard drive setup

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sayth@sayth-TravelMate-5740G:~$ fdisk -l

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x104abfd7

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048    27265023    13631488   27  Hidden NTFS WinRE
/dev/sda2        27265024    27469823      102400    7  HPFS/NTFS/exFAT
/dev/sda3        27469824   786911894   379721035+   7  HPFS/NTFS/exFAT
/dev/sda4       786913218   976773119    94929951    5  Extended
/dev/sda5       786913280   812302335    12694528   83  Linux
/dev/sda6       812304384   816254975     1975296   82  Linux swap / Solaris
/dev/sda7       816257024   909033471    46388224   83  Linux
/dev/sda8       909035520   910059519      512000   83  Linux
/dev/sda9       910061568   976773119    33355776   8e  Linux LVM

and this is my LVM setup.

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sayth@sayth-TravelMate-5740G:~$ sudo pvs
  PV         VG              Fmt  Attr PSize  PFree
  /dev/sda9  vg_sabayonx8664 lvm2 a-   31.78g    0

and

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sayth@sayth-TravelMate-5740G:~$ sudo lvdisplay vg_sabayonx8664
  --- Logical volume ---
  LV Name                /dev/vg_sabayonx8664/lv_root
  VG Name                vg_sabayonx8664
  LV UUID                EZEswp-zXb4-3cGd-d5oC-n9En-JdBB-Pul3ua
  LV Write Access        read/write
  LV Status              NOT available
  LV Size                28.00 GiB
  Current LE             896
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
   
  --- Logical volume ---
  LV Name                /dev/vg_sabayonx8664/lv_swap
  VG Name                vg_sabayonx8664
  LV UUID                eEgzEH-rrRS-fKle-98iu-cAFR-L7su-yK9hXC
  LV Write Access        read/write
  LV Status              NOT available
  LV Size                3.78 GiB
  Current LE             121
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto

Any idea how I can get the correct entry into grub2?

[flebber]

Is there any extra info I could provide that would help?