Thank you for reporting this issue.  I'm afraid I can say decisively
that it's not a bug in pam, however; the permissions of
/sbin/unix_chkpwd as provided by the package do not prevent making a
backup copy of the file during upgrade.  This error indicates that
either you have modified the attributes of your filesystem (using the
'chattr' command), or you have a kernel LSM in place (such as SELinux)
which is misconfigured and prevents dpkg from doing its job, or you have
a corrupted filesystem.  In each of these cases, there's nothing that
can be done in the pam package to account for this.  If you need further
assistance recovering from this problem, please see
http://www.ubuntu.com/support for information about available support
options.

** Changed in: pam (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/772191

Title:
  package libpam-modules-bin (not installed) failed to install/upgrade:
  impossibile creare il collegamento alla copia di backup di
  "./sbin/unix_chkpwd" prima di installarne la nuova versione:
  Operazione non permessa

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