Public bug reported:

Hi,

I've installed Lubuntu 18.04 and found that problem:

the display-manager service complains:

 ● lightdm.service - Light Display Manager
   Loaded: loaded (/lib/systemd/system/lightdm.service; indirect; vendor 
preset: enabled)
   Active: active (running) since Wed 2018-05-02 11:36:27 CEST; 1min 22s ago
     Docs: man:lightdm(1)
  Process: 1717 ExecStartPre=/bin/sh -c [ "$(basename $(cat 
/etc/X11/default-display-manager 2>/dev/null))" = "lightdm" ] (code=exited, 
status=0/SUCCESS)
 Main PID: 1720 (lightdm)
    Tasks: 6 (limit: 4915)
   CGroup: /system.slice/lightdm.service
           ├─1720 /usr/sbin/lightdm
           ├─1726 /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth 
/var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
           └─1786 lightdm --session-child 12 19

Mai 02 11:36:29 pcdanisch lightdm[1735]: PAM unable to dlopen(pam_kwallet5.so): 
/lib/security/pam_kwallet5.so: cannot open shared object file: No such file or 
directory
Mai 02 11:36:29 pcdanisch lightdm[1735]: PAM adding faulty module: 
pam_kwallet5.so
Mai 02 11:36:29 pcdanisch lightdm[1735]: pam_unix(lightdm-greeter:session): 
session opened for user lightdm by (uid=0)
Mai 02 11:36:30 pcdanisch lightdm[1786]: PAM unable to 
dlopen(pam_gnome_keyring.so): /lib/security/pam_gnome_keyring.so: cannot open 
shared object file: No such file or directory
Mai 02 11:36:30 pcdanisch lightdm[1786]: PAM adding faulty module: 
pam_gnome_keyring.so
Mai 02 11:36:30 pcdanisch lightdm[1786]: PAM unable to dlopen(pam_kwallet.so): 
/lib/security/pam_kwallet.so: cannot open shared object file: No such file or 
directory
Mai 02 11:36:30 pcdanisch lightdm[1786]: PAM adding faulty module: 
pam_kwallet.so
Mai 02 11:36:30 pcdanisch lightdm[1786]: PAM unable to dlopen(pam_kwallet5.so): 
/lib/security/pam_kwallet5.so: cannot open shared object file: No such file or 
directory
Mai 02 11:36:30 pcdanisch lightdm[1786]: PAM adding faulty module: 
pam_kwallet5.so
Mai 02 11:36:30 pcdanisch lightdm[1786]: pam_succeed_if(lightdm:auth): 
requirement "user ingroup nopasswdlogin" not met by user "danisch"


It's because /etc/pam.d/lightdm and /etc/pam.d/lightdm-greeter try to load pam 
modules which are not installed since there are not dependencies to 
libpam-gnome-keyring  libpam-kwallet4 libpam-kwallet5


If it is not intended to let things run into error message (and possible
further trouble), you should either remove these lines from the config
files or add dependencies to pull in that packages.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: lightdm 1.26.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: LXDE
Date: Wed May  2 12:21:26 2018
InstallationDate: Installed on 2018-04-30 (2 days ago)
InstallationMedia: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic

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https://bugs.launchpad.net/bugs/1768488

Title:
  dependency problem lightdm -> pam

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