I get my first ssl cert working ok on my domain www.superservidor.cl using webroot plugin on Ubuntu 14.04 + VestaCP 0.9.8 Release 15 (using Apache v2.4.7 + OpenSSL v1.0.1f + PHP 5.5.9)
Nice!
(if you want A+ on SSLLabs, you’ll need long-term HSTS, which can be enabled by adding the header Strict-Transport-Security "max-age=21536000; includeSubdomains; preload"; in your apache or nginx config. note that you should only enable this if you think you’ll keep HTTPS forever)