Can not install akvmod in Linux Mint 19

[hexusdev]

After executing sudo make install I get the error:

➜  src git:(master) sudo make install
make -C /lib/modules/5.3.0-28-generic/build M=/home/dev15/akvcam/src modules_install
make[1]: Entering directory '/usr/src/linux-headers-5.3.0-28-generic'
  INSTALL /home/dev15/akvcam/src/akvcam.ko
At main.c:160:
- SSL error:02001002:system library:fopen:No such file or directory: ../crypto/bio/bss_file.c:69
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: ../crypto/bio/bss_file.c:76
sign-file: certs/signing_key.pem: No such file or directory
  DEPMOD  5.3.0-28-generic
Warning: modules_install: missing 'System.map' file. Skipping depmod.
make[1]: Leaving directory '/usr/src/linux-headers-5.3.0-28-generic'

and this command sudo insmod akvcam.ko leads to this:
insmod: ERROR: could not insert module akvcam.ko: Operation not permitted

[hipersayanX]

This question has been already answered and solved here. Closing as duplicate of #4.