Add CA Certificates in Debain/Ubuntu
Steps below list how to add certificates in debian based distribution
Make sure your certificate is in PEM format (starting with -----BEGIN CERTIFICATE-----) and has the file extension .crt (not .cer or .pem).
1. Copy your certificates to the following folder
/usr/local/share/ca-certificates
2. Run the following command to update the certificate bundle
sudo update-ca-certificates
3. That's it.