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No matter how much I recreate the partition layout (gpt) and install another distribution on it, data from the MOK management/shim for Secure Boot is always there. The only storage device I have is a 32 GB eMMC.

Is it possible that Secure Boot configuration is being stored in another chip? I am looking for a BIOS update to reset everything that could be there. I keep getting a message ("booting in insecure mode...") with a delay of 2 seconds, no matter if I disable or enable Secure Boot.

Can I reset those settings to default, so that no message will appear on boot?

I use Ubuntu MATE. The microcode updates are proprietary, that's why I tried to use MOK Management.

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I had to run sudo mokutil --disable-verification in order to stop the message from appearing at boot. It makes total sense now.

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