Public bug reported:

I just finished installing a freshly downloaded jaunty alternate install
cd using mdadm partitions in linux as a dual-boot with windows, leaving
windows in it's factory-fresh "fakeraid" partition(s).  The only
difficult part was getting rid of dmraid.

I first shrank the windows partitions.  Using the alternate cd, i set up
root on a mdadm partition.  Everything as expected.  Windows booted fine
after it fsck'd itself.  But linux dropped to the initramfs busybox with
the now-familiar error about "no root found, try waiting, etc." upon
first boot.

Using a livecd, i was able to boot, install mdadm, activate my root,
mount it and then /boot on top of it, chroot into it, mount sys, proc,
and dev, and then apt-get remove dmraid.  Finally, i had to uninstall
and re-install mdadm to purge dmraid from initramfs ( see discussion
here: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=534274 ).

Windows "fakeraid" and linux mdadm are now peacefully coexisting.  It's
not clear to me if the core pathology is in dmraid, or in what the
installer puts into initramfs.  Alternately, being able to pass
"nodmraid" as a boot argument would help.

** Affects: dmraid (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: initramfs mdadm

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Dual-boot install using mdadm root fails to boot
https://bugs.launchpad.net/bugs/392510
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