In build/util/efi-image:

                        if wget -q "$file" -O
"$workdir/grub$efi_name.efi" 2>/dev/null

Will lead to a 0-length grubx64.efi and skipping signed shim if wget
fails.

This should be fixed to download to a temp location and only copy in
place if it succeeds and, probably, also be a hard failure if we can
determine that we're expecting this to be a signed build.

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https://bugs.launchpad.net/bugs/1525393

Title:
  xenial secureboot images not signed

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