Comment 10 for bug 120375

Dear brunus,

The problem is not solved in 7.04/7.10.

You have to use "raid_degraded" grub entry with /etc/initramfs-tools/scripts/init-premount/raid_degraded way.
(and update your initramfs, execute "sudo update-initramfs -u")

And, I test with 7.10, mdadm_2.6.2-1ubuntu2_<arch>.deb(7.10's) *does not work* in this way.
When you use 7.10, please down-grade mdadm package.

Use 7.04's mdadm package: "mdadm_2.5.6-7ubuntu5_<arch>.deb".