Can't add new user in lucid

[Tom H]

> I have found it in launchpad:
> https://bugs.launchpad.net/ubuntu/+source/samba/+bug/545864
> It is to do with having installed samba.  It only talks about the
> change password problem but I guess it is also causing the inability
> to login of new users, as it is failing creating the user.

libpam-runtime!

I had just run
aptitude search pam | grep ^i
to try to figure out which package to reconfigure...