yes I tried that as well but it didn't work for me

my grub entry is

menuentry 'Ubuntu, Linux 2.6.18.8 with pv_ops for Xen 4.0.1rc3' --class ubuntu --class gnu-linux --class gnu --class os {
recordfail
insmod ext2
set root='(hd0,5)'
multiboot (hd0,5)/boot/xen-4.0.0.gz dummy=dummy
module    (hd0,5)/boot/vmlinuz-2.6.18.8-xen0 dummy=dummy root=/dev/sda5 nopat ro console=tty0
module    (hd0,5)/boot/initrd.img-2.6.18.8-xen0
}


in /boot/grub/grub.cfg I have the following entry for default boot with ubuntu 10.04. 

menuentry 'Ubuntu, with Linux 2.6.32-23-generic' --class ubuntu --class gnu-linux --class gnu --class os {
    recordfail
    insmod ext2
    set root='(hd0,5)'
    search --no-floppy --fs-uuid --set 98646bed-d837-44aa-b885-ac45a9042659
    linux    /boot/vmlinuz-2.6.32-23-generic root=UUID=98646bed-d837-44aa-b885-ac45a9042659 ro   quiet splash
    initrd    /boot/initrd.img-2.6.32-23-generic
}

I have tried root as UUID as well but it given me the same boot error of not finding root.

My disk partitioning is as follow

 df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda5             9.2G  7.6G  1.2G  88% /
none                  496M  264K  496M   1% /dev
none                  500M  1.3M  499M   1% /dev/shm
none                  500M   92K  500M   1% /var/run
none                  500M     0  500M   0% /var/lock
none                  500M     0  500M   0% /lib/init/rw


- Amina

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