Same behavior on ldap without kerberos.
root@muizenberg:~# lsb_release -d; apt-cache policy unity lightdm libpam-modules|grep Installed; grep unix_chkpwd /var/log/auth.log|tail -3 Description: Ubuntu 14.04 LTS Installed: 7.2.0+14.04.20140423-0ubuntu1.2 Installed: 1.10.1-0ubuntu1 Installed: 1.1.8-1ubuntu2 May 27 09:07:11 muizenberg unix_chkpwd[4186]: check pass; user unknown May 27 09:07:11 muizenberg unix_chkpwd[4186]: password check failed for user (jan) May 27 09:07:11 muizenberg unix_chkpwd[4187]: could not obtain user info (jan)
Workaround in #2 also works for me.
Same behavior on ldap without kerberos.
root@muizenberg:~# lsb_release -d; apt-cache policy unity lightdm libpam-modules|grep Installed; grep unix_chkpwd /var/log/ auth.log| tail -3 04.20140423- 0ubuntu1. 2
Description: Ubuntu 14.04 LTS
Installed: 7.2.0+14.
Installed: 1.10.1-0ubuntu1
Installed: 1.1.8-1ubuntu2
May 27 09:07:11 muizenberg unix_chkpwd[4186]: check pass; user unknown
May 27 09:07:11 muizenberg unix_chkpwd[4186]: password check failed for user (jan)
May 27 09:07:11 muizenberg unix_chkpwd[4187]: could not obtain user info (jan)
Workaround in #2 also works for me.