On systems lacking EFI or the SecureBoot efi var the caching of this info didn#t work, since we'd see ENOENT when reading the var, and cache that, which we then use as reason to retry next time. Let's fix that and convert ENOENT to "secure boot", because that's what it really means. All other errors are left as is (and reason to retry). But let's add some debug logging for that case.
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