[ubuntu] Grub2 fails to install on Ubuntu Server 12.04 with RAID5 + Encrypted LVM

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http://ubuntuforums.org – Hi! I recorded my complete installation until failure: http://www.youtube.com/watch?v=BVe5vja3keo During partitioning I created a software RAID 5 volume spanning three identical disks. On that volume I created an encrypted volume, which I created an LVM inside containing two logical volumes inside a volume group. One logical volume for /boot and one for / (the rest): When it is time to install Grub to the MBR I get the error Executing grub-install /dev/sda failed. This is a fatal error: After that I completed the installation without installing a boot loader. I would greatly appreciat (Hardware)