Colin Watson and Tormod Volden :

This can be enabled in karmic since we now have grub2 which support direct raid 
boot.
Making it possible to install ubuntu on raid requires very little changes now :

1. Install mdadm by default into the livecd environment. (676 Kb)
2. Patch ubiquity to run these commands in the /target chroot AFTER raid has 
been partitioned and ubuntu has been installed to make / accessible from 
initramfs by updating mdadm.conf :
chroot /target /usr/share/mdadm/mkconf > /etc/mdadm/mdadm.conf
chroot /target update-initramfs -u

With these two small changes, it's possible for a user that knows how to
partition and raid from command line to install ubuntu on his raid
device from ubiquity, using manual partitioning. I tried it and it work
perfectly. And it's the first step to make raid accessible from LiveCD.
And since grub2, it's not necessary for partman to make sure that /boot
is installed on a different partition.

Left to implement later :
Ubiquity to manage and offer RAID during installation (looks like Palimpsest is 
already starting to offer functionalities related to raid, which are limited at 
the moment).

-- 
RAID not implemented (use alternate CD instead)
https://bugs.launchpad.net/bugs/44609
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