OpenEdx installation SSL

[Stg11]

Hello, I try to install OpenEdx on an Ubuntu 16.04 server but the installation stops with error

TASK [oraclejdk : Download Oracle Java] ****************************************

fatal: [localhost]: FAILED! => {"changed": false, "failed": true, "msg": "Failed to validate the SSL certificate for edelivery.oracle.com:443. Make sure your managed systems have a valid CA certificate installed. You can use validate_certs=False if you do not need to confirm the servers identity but this is unsafe and not recommended. Paths checked for this platform: /etc/ssl/certs, /etc/pki/ca-trust/extracted/pem, /etc/pki/tls/certs, 

/usr/share/ca-certificates/cacert.org, /etc/ansible.

How can I fix it?

How can set validate_certs to False?

Thank you

[Saad Ali]

Make sure that you have installed all updates on your system and then run again.