HTTPS Configuration (with self-signed certificate)

“sudo a2enmod ssl”

“sudo a2ensite default-ssl”

With Apache2 now configured for HTTPS, restart the service to enable the new settings:

“sudo service apache2 restart”

Source: https://help.ubuntu.com/10.04/serverguide/httpd.html

To force https:

Enable mod_rewrite:

"sudo a2enmod rewrite"

Then add the following to “/etc/apache2/sites-available/default” (first thing after <VirtualHost *:80>):
RewriteEngine   on
RewriteCond     %{HTTPS} !=on
RewriteRule     ^(.*)$ https://%{HTTP_HOST}/$1 [L,R]

Finally restart your Apache2 Server again (or force-reload it if you wish):

“sudo service apache2 restart”

Source: http://www.linode.com/wiki/index.php/Apache2_SSL_in_Ubuntu