Add custom CA to ubuntu

tested with ubuntu 18:04


1) sudo apt-get install ca-certificates



2) copy CA certificate to local:

      sudo cp CERTIFICATE.crt /usr/local/share/ca-certificates/

If your certificate in PEM format, need to convert to .crt using this command:

openssl x509 -outform der -in CERTIFICATE.pem -out CERTIFICATE.crt

3) update certificate

  sudo update-ca-certificates

ref:  

1) https://www.techrepublic.com/article/how-to-install-ca-certificates-in-ubuntu-server/

2) https://www.wikihow.com/Be-Your-Own-Certificate-Authority