Public bug reported:

During boot, I see this error:

> Feb 02 10:50:05 myhost lightdm[3224]: PAM unable to dlopen(pam_kwallet.so): 
> /lib/security/pam_kwallet.so: cannot open shared object file: No such file or 
> directory
> Feb 02 10:50:05 myhost lightdm[3224]: PAM adding faulty module: pam_kwallet.so
> Feb 02 10:50:05 myhost lightdm[3224]: PAM unable to dlopen(pam_kwallet5.so): 
> /lib/security/pam_kwallet5.so: cannot open shared object file: No such file 
> or directory
> Feb 02 10:50:05 myhost lightdm[3224]: PAM adding faulty module: 
> pam_kwallet5.so

which I guess it's caused by this:

> # grep kwallet /etc/pam.d/lightd*
> /etc/pam.d/lightdm:auth    optional        pam_kwallet.so
> /etc/pam.d/lightdm:auth    optional        pam_kwallet5.so
> /etc/pam.d/lightdm:session optional        pam_kwallet.so auto_start
> /etc/pam.d/lightdm:session optional        pam_kwallet5.so auto_start
> /etc/pam.d/lightdm-greeter:auth    optional        pam_kwallet.so
> /etc/pam.d/lightdm-greeter:auth    optional        pam_kwallet5.so
> /etc/pam.d/lightdm-greeter:session optional        pam_kwallet.so auto_start
> /etc/pam.d/lightdm-greeter:session optional        pam_kwallet5.so auto_start

kwallet is a KDE program, which is not installed on MATE (and I think it
shouldn't be), so I guess that such modules should not be [attempted to
be] loaded.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lightdm 1.26.0-0ubuntu1
ProcVersionSignature: Ubuntu 5.3.0-28.30~18.04.1-generic 5.3.13
Uname: Linux 5.3.0-28-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
Date: Sun Feb  2 11:03:53 2020
InstallationDate: Installed on 2020-01-20 (12 days ago)
InstallationMedia: Ubuntu-MATE 18.04.3 LTS "Bionic Beaver" - Release amd64 
(20190805)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: lightdm (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic third-party-packages

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https://bugs.launchpad.net/bugs/1861598

Title:
  lightdm assumes pam-kwallet to be always installed

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