at the moment 'grub-pc' is broken in sid. When you have a separate /boot partition, the package generates a wrong '/boot/grub/grub.cfg'. Look at the BTS for bug #558042. There is also the workaround for the problem. Hth Michael
I ran across the same problem, but I am running mdraid RAID 1, which complicates matters, and root (/) is on an LVM2 volume.
Any advice? Mark Allums