This guide will help you setup SSL with apache2. Note: This manual applies to ubuntu versions prior to Ubuntu Feisty (7.04). The apache2-ssl-certificate script used in this manual isn't included anymore starting from Feisty. Please check the official Ubuntu documentation: https://help.ubuntu.com/7.10/server/C/httpd.html#https-configuration for instructions how to setup apache2 with SSL.

http://www.linode.com/wiki/index.php/Apache2_SSL_in_Ubuntu
https://help.ubuntu.com/7.10/server/C/httpd.html#https-configuration