disk mduuid not found

[Michael Hipp]

Hello,

I'm trying to install 12.04.2 to a small LAN server for a client. 
Configuration:

   md0 /dev/sda1 /dev/sdb1  / (root, including /boot)
   md1 /dev/sda2 /dev/sdb2  swap
   md2 /dev/sda3 /dev/sdb3  /mnt/data

All are software RAID1 with 2 devices no failovers. Install went fine, 
but upon bootup I'm confronted with:

   error: disk 'mduuid/{hex uuid stuff}' not found
   grub rescue>

Google found lots of hints about this problem but seemingly no 
solutions. Can someone instruct me how to get this thing to boot correctly?

Thanks,
Michael