I think you should report this against mdadm instead ( https://bugs.launchpad.net/ubuntu/+source/mdadm/ ) since if you've made a standard hard disk install of Ubuntu then UNetbootin doesn't have anything to do with your issue.
I think you should report this against mdadm instead ( https:/ /bugs.launchpad .net/ubuntu/ +source/ mdadm/ ) since if you've made a standard hard disk install of Ubuntu then UNetbootin doesn't have anything to do with your issue.