I just made a fresh install from ubuntu-16.04.2-server-amd64.iso, updated everything, and tested to boot without one disk. It failed. See the attachment for my RAID configuration.
https://imgur.com/a/RApJS ** Attachment added: "partitioning.png" https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1635049/+attachment/4855039/+files/partitioning.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1635049 Title: Boot fails with degraded mdadm raid To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1635049/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs