Comment 5 for bug 1077650

I just checked that it got broken between 11.10 and 12.04 release. So if there's someone capable of checking what versions of mdadm and initramfs-tools do these two distribution have, then maybe it leads to the solution.

One thing I noticed from a user perspective is that 11.10 installer (alternative) was asking me a question:

  do you want degraded RAID array to start

And in 12.04 and 12.10 the installer stopped asking this question. I'm not sure if it's relevant.