You've shared that you have Ubuntu so one could use the command line ... unless you've not shared something about the system that prevents you from accessing the terminal/CLI.
https://askubuntu.com/questions/643037/how-to-enable-tls-1-2-in-apache
https://askubuntu.com/questions/440139/which-tls-protocols-are-enabled-in-ubuntu-14-04s-openssl
Moodle, for the most part, does attempt to stay secure ... and up to date with things that support moodle code/server.
While 14.04 is long term support wonder if not upgrading to 16.04 wouldn't be best as that version is Linux Standards Based now.
But, shall defer to anyone else who runs Ubuntu for corrections or better explanations or better advice. ;)
'spirit of sharing', Ken