Public bug reported:

I ran sudo pam-auth-update, enabled "Fingerprint authentication",
selected "OK", and then rebooted.

GDM wouldn't start after the reboot:

Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: 
dbus-daemon[1553]: [session uid=121 pid=1553] Activating service 
name='org.freedesktop.systemd1' requested by ':1.0' (uid=121 pid=1551 
comm="/usr/lib/gdm3/gdm-wayland-session gnome-session --" label="unconfined")
Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: 
dbus-daemon[1553]: [session uid=121 pid=1553] Activated service 
'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with 
status 1
Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: Unable to 
register display with display manager

I logged in on a VT and ran pam-auth-update again. I observed that
"Register user sessions in the systemd control group" was not selected,
even though my recollection was that it had been selected before I
enabled fingerprint authentication, and I didn't disable it.

I unselected fingerprint authentication and selected "Register user
sessions in the systemd control group" and rebooted again. GDM started
working again.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: libpam-runtime 1.3.1-5ubuntu1
ProcVersionSignature: Ubuntu 4.19.0-13.14-generic 4.19.20
Uname: Linux 4.19.0-13-generic x86_64
ApportVersion: 2.20.10-0ubuntu21
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed Feb 27 06:31:32 2019
InstallationDate: Installed on 2019-02-26 (0 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: pam
UpgradeStatus: Upgraded to disco on 2019-02-26 (0 days ago)

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


** Tags: amd64 apport-bug disco wayland-session

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https://bugs.launchpad.net/bugs/1817897

Title:
  attempting to enable fingerprint with pam-auth-update breaks gdm

Status in pam package in Ubuntu:
  New

Bug description:
  I ran sudo pam-auth-update, enabled "Fingerprint authentication",
  selected "OK", and then rebooted.

  GDM wouldn't start after the reboot:

  Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: 
dbus-daemon[1553]: [session uid=121 pid=1553] Activating service 
name='org.freedesktop.systemd1' requested by ':1.0' (uid=121 pid=1551 
comm="/usr/lib/gdm3/gdm-wayland-session gnome-session --" label="unconfined")
  Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: 
dbus-daemon[1553]: [session uid=121 pid=1553] Activated service 
'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with 
status 1
  Feb 27 06:29:41 jik-x1 /usr/lib/gdm3/gdm-wayland-session[1551]: Unable to 
register display with display manager

  I logged in on a VT and ran pam-auth-update again. I observed that
  "Register user sessions in the systemd control group" was not
  selected, even though my recollection was that it had been selected
  before I enabled fingerprint authentication, and I didn't disable it.

  I unselected fingerprint authentication and selected "Register user
  sessions in the systemd control group" and rebooted again. GDM started
  working again.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: libpam-runtime 1.3.1-5ubuntu1
  ProcVersionSignature: Ubuntu 4.19.0-13.14-generic 4.19.20
  Uname: Linux 4.19.0-13-generic x86_64
  ApportVersion: 2.20.10-0ubuntu21
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Feb 27 06:31:32 2019
  InstallationDate: Installed on 2019-02-26 (0 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 
(20190210)
  PackageArchitecture: all
  SourcePackage: pam
  UpgradeStatus: Upgraded to disco on 2019-02-26 (0 days ago)

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