I'm not sure why but it seems that a number of people have piled onto this bug report with unrelated issues. The original issue here was simply that grub won't install to a raid without mdadm installed. Since that isn't a bug, I'm closing this report.
** Changed in: grub-installer (Ubuntu) Status: Confirmed => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1315344 Title: Grub install failed on disks with software RAID To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1315344/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs