Update Lenny to Squeeze
I have upgrade my Debian Lenny to Debian Squeeze and I don't know if it's only on my case but Imust upgrade grub, linux-image (2.6.26 to 2.6.32) and udev in this order.
grub before linux-image because linux-image-2.6.32 don't upgrade /boot/grub/menu.list
linux-image before udev because udev (158-1) return error if the kernel is 2.6.26.
I don't know where is the work on upgrade documentation but I wanted underline this order.