Actually, nevermind that. The files would not be signed correctly to work with Secure Boot (at least, not without more fiddling).
Please use http://archive.ubuntu.com/ubuntu/dists/artful/main/uefi/grub2-amd64/2.02~beta3-4ubuntu6/grubnetx64.efi.signed , using that file from artful (to replace your grubx64.efi) should be sufficient to test. It already includes the fix.
Actually, nevermind that. The files would not be signed correctly to work with Secure Boot (at least, not without more fiddling).
Please use http:// archive. ubuntu. com/ubuntu/ dists/artful/ main/uefi/ grub2-amd64/ 2.02~beta3- 4ubuntu6/ grubnetx64. efi.signed , using that file from artful (to replace your grubx64.efi) should be sufficient to test. It already includes the fix.