Change expired password dialog missing

[Joshua Burgess]

On Ubuntu-mate 16.04.2, with FreeIPA 4.3.1.0, SSSD 1.13.4-1 and LightDM 1.18.3 (with lightdm-gtk-greeter 2.0.1-2) I am not seeing the normal prompts that should come up when a user's password has expired. When a user attempts to log in with an expired password, they should be notified that their password has expired, and then prompted to re-enter their current password. If their current password is accepted, they should then be prompted to enter a new password. If that password meets the system's requirements, they should then be prompted to enter their new password a second time to confirm it.

On my system I am seeing the first message, the user is informed that their password has expired and must be changed. However, I am not seeing any subsequent prompts. The user is presented with a blank password field three times with no instruction. Their login will succeed if they know they need to enter their current password, press enter, enter their new password, press enter, and then enter their new password again, and press enter, there is just no dialog to inform them of this.

If I install GDM on the same system and set it as the default, it works correctly. A text notification is displayed, telling the user what to enter in the password field (i.e "Current Password", "New Password", "Confirm New Password"). If I install the Unity-greeter that comes with Ubuntu 16.04 standard, it also works correctly.