How to restore pam configuration?

I did some modifications in /etc/pam.d/common-auth, /etc/pam.d/common-account, /etc/pam.d/common-password, /etc/pam.d/common-session files. Is there any way to restore default pam configuration?

I am using ubuntu 12.04


Solution 1:

I believe the pam-auth-update command resets to defaults.