Can confirm this with a fresh installation from daily/20070301/feisty-
server-amd64.iso.

Setup:
- only one disk
- md0 raid1 mounted as / (/dev/sda1 + other mirror missing, the installation ui 
actually permits this)
- md1 raid1 unused (/dev/sda3 + other mirror missing)

On the first boot I got to the initramfs prompt, with only md1 active:
mdadm: No devices listed in conf file were found.
stdin: error 0
Usage: modprobe ....
mount: Cannot read /etc/fstab: No such file or directory
mount: Mounting /root/dev ... failed
mount: Mounting /sys ... failed
mount: Mounting /proc ...failed
Target filesystem doesn't have /sbin/init

/bin/sh: can't access tty; job control turned off
(initramfs)

Second try gave the same prompt, but now md0 was active. However, it
didn't boot:

(initramfs) cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[0]
      15623104 blocks [2/1] [U_]

Finally, on the third try, it booted  (well, got some warnings about
missing /dev/input/mice or something like that, but that's not the point
here).

Now I'm just sticking with / as a normal partition (+ others like /home
as raid1). I'm hoping that the migration to raid1 goes fine after this
problem has been fixed.

-- 
boot-time race condition initializing md
https://launchpad.net/bugs/75681

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