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A signature error occurred "module verification failed: signature and/or required key missing - tainting kernel"

• Module signature verification is a kernel feature, which needs to be enabled through the Linux kernel compilation.
• Solution 1: When compiling the kernel, add CONFIG_MODULE_SIG=n.
• Solution 2: Sign the kernel module with the certificate, as shown below:
  /usr/src/linux-4.9.61/scripts/sign-file sha512/usr/src/linux-4.9.61/certs/signing_key.pem /usr/src/linux-4.9.61/certs/signing_key.x509 toa.ko

The /lib/modules directory is missing during compilation

• This error is often associated with the following situations:
• The kernel package is not installed.
• When the directory is modified, you need to correct it by yourself.
• When the kernel does not have the build directory, you need to manually create a soft link to the exact version of the kernel header.
  cd /lib/modules/4.9.0-13-amd64 && ln -s /usr/src/linux-headers-4.9.0-13-amd64 build