You appear to be using a fakeraid. You therefore need to install grub to the fake raid array ( /dev/mapper/isw_ccccjejaag_VOL1 ), not one of the individual drives.
** 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/986252 Title: Installer crashed, unable to write GRUB to /dev/sda To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/986252/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs