In my earlier comment (#5) I mentioned installing libnss-ldapd / libpam-ldapd as replacements for libnss-ldap / libpam-ldap. This did *not* solve the issue with group mappings: I experience the group mapping failures with both versions of the libnss and libpam LDAP packages on my 12.04 server.
In my earlier comment (#5) I mentioned installing libnss-ldapd / libpam-ldapd as replacements for libnss-ldap / libpam-ldap. This did *not* solve the issue with group mappings: I experience the group mapping failures with both versions of the libnss and libpam LDAP packages on my 12.04 server.