I'm running the latest version of Ubuntu and I get the following error when trying to change a password :
passwd : authentication token error
passwd : password unchanged
The same happen when I add a user. Here are the permissions for passwd and shadow files
-rw-r--r-- 1 root root 1569 2009-05-11 10:36 passwd
-r--r----- 1 root shadow 939 2009-05-11 10:36 shadow
After a few hours of searching through the web I didn't find anything that fixes my problem. I found this article http://www.linuxquestions.org/questions/linux-newbie-8/passwd-authentication-token-manipulation-error-236955/
that talks about a file /etc/pam.d/system-auth but I don't have a file with this name in /etc/pam.d. This image is almost freshly installed, the only thing I did after the installation was join the domain with likewise-open and check out a few things with gconf. Any ideas ?