Switching to worker mpm from prefork apache 2 on ubuntu

I'm on ubuntu and according to some tutorials, the following lines would do all the tricks:

apt-get install apache2-mpm-worker libapache2-mod-fastcgi php5-fpm php5-gd
a2enmod actions fastcgi alias

Then you setup configuration in /etc/apache2/conf.d/php5-fpm.conf:

<IfModule mod_fastcgi.c>
                AddHandler php5-fcgi .php
                Action php5-fcgi /php5-fcgi
                Alias /php5-fcgi /usr/lib/cgi-bin/php5-fcgi
                FastCgiExternalServer /usr/lib/cgi-bin/php5-fcgi -host 127.0.0.1:9000 -pass-header Authorization</IfModule>

After all these, restart:

service apache2 restart && service php5-fpm restart

Done!