You booted the installer in bios mode but appear to be trying to install to a disk that is set up to boot in UEFI mode. You need to boot the installer in UEFI mode.
** 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/1765955 Title: grub install failed when trying minimL install option from ubiquity on a multi drive system tried installing grub on sdb To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1765955/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs