RAID support can be implemented in Ubiquity with simple 3-part patch - I
just installed Ubuntu 8.04 LiveCD based Baltix distro into software RAID
devices:

1. /lib/partman/init.d/30parted should report /dev/md* devices to Ubiquity - 
line "grep -v '^/dev/md' | " should be removed from 30parted file. I've 
commented out this line with:
sed -i "s,\( *grep -v '^/dev/md' |\),#\1," /lib/partman/init.d/30parted

2. Sofware RAID volumes (devices) should be visible, ideally this should be 
implemented in manual partitioning step of Ubiquity. Currently I've executed 
these commands:
mdadm --create /dev/md0 --level=1 --raid-disks=2 /dev/sda1 /dev/sdb1 
mdadm --create /dev/md1 --level=1 --raid-disks=2 /dev/sda2 /dev/sdb2 

3. /target system should have mdadm package installed before initrd and 
grub-install are executed in /target . I'm suggesting to include mdadm package 
in CD's pool folder and patch Ubiquity to automatically install mdadm into 
/target if user decided to install Linux into md device (/dev/md* are assigned 
to one or more  folders). 
If mdadm package isn't in /target when Ubiquity executes grub-install then 
Ubiquity finishes installation at 94% with fatal error:
grub-installer: info: Running chroot /target grub-install  --no-floppy  "(hd0)"
grub-installer: /usr/sbin/grub-install: 446: mdadm: not found
grub-installer: : mdadm -D /dev/md0 failed
grub-installer: Searching for GRUB installation directory
 ... found: /boot/grub
grub-installer: The file /boot/grub/stage1 not read correctly.
grub-installer: error: Running 'grub-install  --no-floppy  "(hd0)"' failed.

Currently I solved this problem simply by executing this command after Ubiquity 
installs language packs (at ~85%):
sudo chroot /target/ apt-get install mdadm

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