Your primary hard drive ( /dev/sda ) is partitioned with GPT, but you are booting in BIOS mode. To install grub to this drive, you need to create a 1 mb bios_grub partition on it. Or you can choose to install grub to /dev/sdb, and make sure that your bios is set to boot from that 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/1682793 Title: can't install grub To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1682793/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs