.htaccess: Invalid command ‘ExpiresActive’, perhaps misspelled or defined by a module not included in the server configuration,

ln -s /etc/apache2/mods-available/expires.load /etc/apache2/mods-enabled/

.htaccess: Invalid command ‘Header’, perhaps misspelled or defined by a module not included in the server configuration

a2enmod headers

At the end… restart Apache!

service apache2 restart