Apache module "mod_headers" is not installed.

Как бы включить mod_headers и mod_expires в Apache2 ?
все просто и элементарно.

#a2enmod headers
Enabling module headers
To activate the new configuration, you need to run:
service apache2 restart

#a2enmod expires
Enabling module expires
To activate the new configuration, you need to run:
service apache2 restart
# /etc/init.d/apache2 restart