I have created own custom key for secure booting using openssl,I have signed bootloader(shimx64.efi,mmx64.efi and grubx64.efi) and along with initrd- and vmlinuz--generic after installation on 16.04 using sbsigntool,put the key into bios.my obesrvation is if vmlinuz is signed with different key or usigned,grub allows to boot kernel(vmlinuz).what configuration needs to do extra?it will very much helpful any clue i will get from here.Thanks in advance.

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