Hi,

In my experience, one device used in an md array has been renumbered after 
upgrading from oneiric to precise.
At the first reboot, I've got the message 'Continue boot y/N' but can't enter 
anything.
After few seconds, I've got a busybox/initramfs prompt on TTY1, but without any 
further informations for misassembled array.
CTRL+D at prompt give me access to a root terminal so I can rename mdadm.conf 
and comment md array in fstab.
I do that because it was the last messages in dmesg but there was no warning 
about devices not found.
So, system boots fine, and then I could manualy :
- change mdadm.conf to reflect the change of named device/partition ( sdc --> 
sda).
- update initramfs and active mount in fstab.

I never though that making a 'simple' dist-updgrade could leave the system 
un-bootable without such admin (geek) skills !!
Maybe a kind of warning can be added on release notes for people using softraid.

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https://bugs.launchpad.net/bugs/872220

Title:
  Fails to boot when there's problems with softraid

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