Pavillion 500-368na: ERROR of UEFI: verification failed (15) access denied

Since today when I start or restart my PC, I immediately get a blue screen that says:

Verification failed: (15) access denied

I press return to enter 'OK' and get another blue screen called "Shim UEFI key management.

I gives me 3 options: continue start; Register the disk key; Enter the hash of the disc

If I select Register hash/key I have a long list - I tried selecting some of them, but the key is not found [message: only the encoded DER certificate (*.cer/der/crt) is supported].

If I select continue starting I boot directly into Windows 8.1 (64-bit) despite my system dual-boot with a Linux distribution (and work with Linux and Windows perfectly until today). Every time I have start or restart, I have to go through this same sequence and can only start Windows.

Info additional possiblly important:

(1) I was prompted to upgrade to Windows 10 but have not yet done yet - I "hide" the 8.1-> upgrade option 10.

(2) yesterday (i.e. just before this problem appeared) the HP Support Assistant "HP PC Hardware Diagnostics UEFI" updated version 5.8.2.0

At any expert UEFI tips to overcome this problem of access denied or tell me how to register the key that seems to be lost for some reason?

Thank you very much.

Hello

Looks like you have a GRUB that there is little support on this forum to deliver.  You could try the Linux forum.

Tags: HP Desktops

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