I'm sort of confused by the bug report.
Here are the relevant snippets from the man-pages:
UsePAM Enables the Pluggable Authentication Module interface. If
set to
``yes'' this will enable PAM authentication using
ChallengeResponseAuthentication and PasswordAuthentication in
addition to PAM account and session module processing for all
authentication types.
Because PAM challenge-response authentication usually serves an
equivalent role to password authentication, you should disable
either PasswordAuthentication or ChallengeResponseAuthentication.
If UsePAM is enabled, you will not be able to run sshd(8) as a
non-root user. The default is ``no'
...
PrintMotd
Specifies whether sshd(8) should print /etc/motd when a user logs
in interactively. (On some systems it is also printed by the
shell, /etc/profile, or equivalent.) The default is ``yes''
...
PrintMotd *only* is documented as controlling interactive logins. I believe all
affected users so far have indicated (if at all) they are using key-based
authentication, which is unaffected by PrintMotd's setting either way.
UsePAM, on the other hand, displays the MOTD because /etc/pam.d/sshd
contains (on 16.04, at least) by default:
# Print the message of the day upon successful login.
# This includes a dynamically generated part from /run/motd.dynamic
# and a static (admin-editable) part from /etc/motd.
session optional pam_motd.so motd=/run/motd.dynamic
session optional pam_motd.so noupdate
and PAM is managing the ssh login session when so configured for sshd.
At this point, I think it's not a bug, and I'm marking it as invalid.
Please reopen as new with justification if you feel this is incorrect.
** Changed in: openssh (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/543767
Title:
ssh logins doesn't show the MOTD when connecting with public key
authorisation
Status in Ubuntu Server papercuts:
Incomplete
Status in openssh package in Ubuntu:
Invalid
Bug description:
This is merely a minor annoyance, but nonetheless worth a bug report
for the servers papercut team:
The method to display a MOTD described in the official Ubuntu server
guide, chapter 22 (https://help.ubuntu.com/9.10/serverguide/C/update-
motd.html) doesn't work as soon as you connect with public key
authorisation.
Connecting /w password only shows the MOTD correctly.
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