How to change/disable password complexity test when changing password?

11.10 - How to change/disable password complexity test when changing password? - Ask Ubuntu
http://askubuntu.com/questions/113682/how-to-change-disable-password-complexity-test-when-changing-password

Change the following line in /etc/pam.d/passwd

password    [success=1 default=ignore]  pam_unix.so obscureminlen=1 sha512