Apologies for the rushed bug report. When I experienced these errors, I have installed grub2.14 (upgrading `grub-efi-amd64-unsigned`, `grub-efi-amd64-signed`, `grub2-common`, `grub-common`, & `grub-efi-amd64-bin`) from the Debian Sid repositories, which are already signed. Grub was not self-built nor self-signed.
What's peculiar is that I tried upgrading to grub2.14 again from the Debian repositories (executing `grub-install` and `update-grub` again), but the same error messages occurred on the second attempt. Downgrading to grub2.12 works as normal. So please reopen this bug report as I believe this could be a legitimate bug with grub2.14.
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