9.10: Grub -> LVM / mdadm hook not found after kernel update

[Tom H]

> again i have the problem, that i can't boot my system with the latest
> kernel update 2.6.31-16-generic. The boot loader tells me, that hooks
> for lvm/mdadm are not found. Bad. So have to boot the old kernel.
>
> I have on boot partition and the system is on a raid1 (mdadm) and lvm
> inside.

Can you boot from the new kernel but using the old initrd?

(Make a note of the old kernel's initrd name and reboot. At your grub
menu, select the new kernel's entry, press "e", change the initrd line
to match the old kernel's initrd, and press "ctrl-x".)