I'm trying to build Droidcam.  Part of the install process wants to sign a driver:

"Secure Boot is enabled, attempting to sign the driver
please specify signing key location (or leave empty to sign manually later)
You can Google 'secure boot' for your distro

Enter the path of the public key:"

Googling didn't show me a clear answer.  Does anyone know what path it's looking for?

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Rich