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Vanilla 5.4.249: Boot signed kernel

kr flag

I rebuilt vanilla 5.4.249 (x86_64) downloaded from kernel.org It boots Ok. Then I tried to sign bzImage using the same procedure I found for ubuntu: sign linux kernel for secure boot

But I got: error: bad shim signature

I'm booting the signed kernel with signed grub 2.06 I installed with knoppix 9.1. Signed grub is booting Ok.

Is it possible that the signing procedure for Ubuntu is different from the procedure for Vanilla ? Should I sign the kernel with the same keys used to sign grub ?

Thank you, Zvika

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