We need a bit more context. Is this a fresh install using the Zentyal CD? Or have you installed it on top of an already configured Ubuntu Server?
I have like 24 Ubuntu servers all installed same way none have this issue, the e-box/zentyal install modifies the pam authentication BUT dont leave the pam passwd change intact.
I installed in order from the
Published Ubuntu CD from Ubuntu website the Ubuntu and only added
open ssh Server as application therfore it could be seen as an basic install.
then I ran
aptitude update after adding the corect deb enty in the sources.list and
aptitude safe-upgrade after setting the hostname in hosts and /etc/hostname I rebooted and did an
aptitude install ebox-all.
I kept it updated via
aptitude safe-upgrade even this morning as I still want to make sure it is stable before comitting into production.