cURL error 60: SSL certificate unable to get local issuer certificate

• Ubuntu: 15.04
• Laravel: 5.4.32
• GuzzleHttp\Guzzle: ~6.0

Hi there

I have the following error when I am trying to reset a password using Laravel's built in authentication. When I enter my email and hit reset I get...

GuzzleHttp\Exceptions\RequestException cURL error 60: SSL certificate problem: unable to get local issuer certificate (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)

I have googled this error and it from everything I have read I have tried the following, all of which have not worked...

• Ran phpinfo() to find the correct php.ini
• Updated the curl.cainfo php.ini settings to "/etc/ssl/certs/cacert.pem"
• Updated the curl.cainfo php.ini settings to "/etc/ssl/certs/ca-certificated.crt"
• Updated the openssl.cafile php.ini settings to "/etc/ssl/certs/cacert.pem"
• Updated the openssl.cafile php.ini settings to "/etc/ssl/certs/ca-certificated.crt"

After each I have restarted apache, however, nothing has worked.

I have also ran var_dump(openssl_get_cert_locations()); which gave me the following...

[
    "default_cert_file" => "/usr/lib/ssl/cert.pem", 
    "default_cert_file_env" => "SSL_CERT_FILE",
    "default_cert_dir" => "/usr/lib/ssl/certs",
    "default_cert_dir_env" => s"SSL_CERT_DIR",
    "default_private_dir" => "/usr/lib/ssl/private",
    "default_default_cert_area" => "/usr/lib/ssl",
    "ini_cafile" => "/etc/ssl/certs/ca-certificates.crt",
    "ini_capath" => "/etc/ssl/certs" ,
]

Can anyone give me some ideas to try? What am I missing?

Thanks