Assuming you have an SSL certificate already downloaded and available on the server.
root@www:~#nano /etc/apache2/sites-available/default-ssl.conf
# line 3: change admin email ServerAdminwebmaster@srv.world # line 32,33: change to the certs gotten in section [1] SSLCertificateFile /etc/letsencrypt/live/www.srv.world/cert.pem SSLCertificateKeyFile /etc/letsencrypt/live/www.srv.world/privkey.pem # line 42: uncomment and change to the chain-file gotten in section SSLCertificateChainFile /etc/letsencrypt/live/www.srv.world/chain.pem
root@www:~#a2ensite default-ssl
Enabling site default-ssl
