It looks like you tried to install to sda firs,t which is partitioned using GPT, and you aren't using EFI. For a bios based machine to boot from GPT, you have to create a 1 MiB bios_grub partition on it. Could you try to install again on one of the other drives without first trying sda?
** Changed in: grub-installer (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1264226 Title: can't install grub To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1264226/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs