Grub can not be installed on /dev/sda because it has no partitions. You either need to create at least one partition there, or choose to install grub to another drive instead.
** Changed in: grub-installer (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1557848 Title: Reinstalling Ubuntu 16.04 on a 5 hard drive system /dev/sda is a boot drive wd ssd got wiped by manajro then inaccessible and default root need help To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1557848/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs