Before you have to scrap the notebook: http://archive.ubuntu.com/ubuntu/dists/xenial-updates/main/uefi/grub2-amd64/current/grubx64.efi.signed is much newer, but should also work.
Before you have to scrap the notebook: http:// archive. ubuntu. com/ubuntu/ dists/xenial- updates/ main/uefi/ grub2-amd64/ current/ grubx64. efi.signed is much newer, but should also work.