From: horsey_guy@proton.me   
      
   This is an OpenPGP/MIME signed message (RFC 4880 and 3156)   
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   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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