curl: (60) SSL certificate problem: unable to get local issuer certificate

curl: (60) SSL certificate problem: unable to get local issuer certificate curl performs SSL certificate verification by default, using a "bundle" of Certificate Authority (CA) public keys (CA certs). If the default bundle file isn&adequate, you can specify an alternate file using the --cacert option. the bundle, the certificate verification probably failed due to a problem with the certificate (it might be expired, or the name might not match the domain name in the URL). If you&like to turn off curl&verification of the certificate, use the -k (or --insecure) option.