I followed this guide: https://certbot.eff.org/#ubuntutrusty-apache
The strange thing is that it didn’t produce errors, it asked me to select numbers of all the websites I want to create a certificate, and I selected more than 10 but in etc/letsencrypt/live there is only one certificate for http://designexcellent.com
My operating system is (include version): Ubuntu 14.04
My web server is (include version): Apache 2
My hosting provider, if applicable, is: Digitalocean
You have obtained one certificate, for all the domains, so it will work for any of the 14 domains you have listed. userexperiencestudio.com is using a valid certificate