And actually this is a very recent regression. In the live env I downgraded grub-common and grub-pc to 1.99~20110104-2ubuntu1 and the probe command returns correctly:
#grub-probe --verbose --target=device /cdrom/boot/grub /dev/sda2
And actually this is a very recent regression. In the live env I downgraded grub-common and grub-pc to 1.99~20110104- 2ubuntu1 and the probe command returns correctly:
#grub-probe --verbose --target=device /cdrom/boot/grub
/dev/sda2