How to add mosquitto password on Ubuntu

On Ubuntu 12.04.4 LTS, after mosquitto is installed using 'sudo apt-get install mosquitto', I go to /etc/mosquitto and try to add a password by entering the command 'mosquitto_passwd -c passwd myuser'. But mosquitto_passwd cannot be found.

In CentOS6, 'mosquitto_passwd -c passwd myuser' works correctly and creates a password file called "passwd" with a user called "myuser". I also found it a little odd that in CentOS6, /etc/mosquitto has a bunch of example files and a conf.d folder where the configuration needs to be added. Ubuntu only has the one mosquitto.conf file right at /etc/mosquitto/mosquitto.conf.

Can the differences between the Ubuntu and CentOS versions be explained?