[Bug 1165461] Re: pam_winbind offline logon does not work in 12.04

[Giuseppe Paterno']

I'm not in charge of the bug, but  if your problem is missing passwd information, then the behavior of PAM  might be correct.
PAM is supposed to handle authentication only, NSS is the responsible part of getting user's info.
You might have a closer look to:
a) nscd, to cache users' info
b) SSSD (System Security Services Daemon), that is included in Ubuntu, to allow NSS information to be propagated and locally cached.
My eur 0.01

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Title:
  pam_winbind offline logon does not work in 12.04

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