My problem (encrypted RAID1 drive refusing to boot when degraded) was fixed by adding a new initramfs boot script to start the RAID array before cryptsetup runs:
http://feeding.cloud.geek.nz/posts/the-perils-of-raid-and-full-disk-encryption-on-ubuntu/
That's on 12.04.3.
My problem (encrypted RAID1 drive refusing to boot when degraded) was fixed by adding a new initramfs boot script to start the RAID array before cryptsetup runs:
http:// feeding. cloud.geek. nz/posts/ the-perils- of-raid- and-full- disk-encryption -on-ubuntu/
That's on 12.04.3.