Comment 18 for bug 1309535

This is due to us adding pam_kwallet to the configuration so that KDE could work correctly with LightDM (bug bug 1305307). The warning occurs in Ubuntu because you don't have pam-kwallet installed and PAM warns if a module is not found (even if it is marked optional as in this case). KDE users will have a similar warning about pam_gnome_keyring being missing.

The only solutions I can think of are:
- Force users to install both libpam-gnome-keyring and pam-kwallet (seems excessive)
- Modify PAM not to report the error (but I don't think PAM can really tell if we expected the module to not exist).
- Use different PAM configuration for kubuntu/ubuntu (but then you can't log into both from the same install).
- ...

Give the warning is harmless I'm not proposing taking any action.