Same happened to me. I think the problem lies in the reference to ldap server.
With "pam_ldap.conf" my ref is a uri and works, but when I make it a straight host name ref, then it hangs.
Dunno if this helps.

On Mon, Apr 7, 2008 at 6:49 PM, Dustin Kirkland <kirkland@canonical.com> wrote:
@Brian-

I'm still trying, albeit unsuccessfully, to reproduce this problem.  It
seems that the complexity of the configuration is a bit deeper than in
my test cases.

If possible, would you (or anyone else) who is seeing this problem in
Hardy Beta please ping me in IRC?  My handle is 'kirkland' and you
should be able to find me in #ubuntu-server on irc.freenode.net.

In the mean time, could you please post (or email me) the following configuration files:
* /etc/nsswitch.conf
* /etc/ldap.conf
* /etc/services
* /etc/pam.d/common-password
* /etc/pam.d/common-auth
* /etc/pam.d/common-account
* /etc/pam.d/common-session
* /etc/ldap/ldap.conf

Also, please send a dump of all packages installed:
* dpkg -l

Thanks,
:-Dustin

--
ldap config  causes Ubuntu to hang at a reboot
https://bugs.launchpad.net/bugs/155947
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