journalctl snippet:

May 14 21:17:01 envybird CRON[3407]: pam_unix(cron:session): session opened for 
user root by (uid=0)
May 14 21:17:01 envybird CRON[3408]: (root) CMD (   cd / && run-parts --report 
/etc/cron.hourly)
May 14 21:17:01 envybird CRON[3407]: pam_unix(cron:session): session closed for 
user root
May 14 21:17:29 envybird gnome-shell[3174]: Fontconfig warning: Directory/file 
mtime in the future. New fonts may not be detected.
May 14 21:17:46 envybird dbus-daemon[804]: [system] Activating via systemd: 
service name='net.reactivated.Fprint' unit='fprintd.service' requested by>
May 14 21:17:46 envybird systemd[1]: Starting Fingerprint Authentication 
Daemon...
May 14 21:17:46 envybird dbus-daemon[804]: [system] Successfully activated 
service 'net.reactivated.Fprint'
May 14 21:17:46 envybird systemd[1]: Started Fingerprint Authentication Daemon.
May 14 21:17:46 envybird fprintd[3428]: free(): invalid pointer
May 14 21:17:46 envybird systemd[1]: fprintd.service: Main process exited, 
code=dumped, status=6/ABRT
May 14 21:17:46 envybird systemd[1]: fprintd.service: Failed with result 
'core-dump'.
May 14 21:18:00 envybird gnome-shell[3174]: Fontconfig warning: Directory/file 
mtime in the future. New fonts may not be detected.
May 14 21:18:22 envybird rtkit-daemon[1276]: Supervising 4 threads of 2 
processes of 1 users.
May 14 21:18:22 envybird rtkit-daemon[1276]: Supervising 4 threads of 2 
processes of 1 users.
May 14 21:18:31 envybird gnome-shell[3174]: Fontconfig warning: Directory/file 
mtime in the future. New fonts may not be detected.
May 14 21:19:02 envybird gnome-shell[3174]: Fontconfig warning: Directory/file 
mtime in the future. New fonts may not be detected.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-control-center in Ubuntu.
https://bugs.launchpad.net/bugs/1878285

Title:
  gnome-control-center crashes on setting up fingerprint

Status in gnome-control-center package in Ubuntu:
  Incomplete

Bug description:
  When I try to setup my fingerprint in gnome-control-center, I first
  have to choose which finger I would use, and when I press the "next"
  button, it crashes : "Unable to access device "Validity VFS0050"
  GDBus.Error:org.freedesktop.DBus.Error.NoReply:Message recipient
  disconnected from message bus without replying".

  
  For information, my fingerprint sensor is :
  - lsusb
  Bus 001 Device 005: ID 138a:0050 Validity Sensors, Inc. Swipe Fingerprint 
Sensor

  
  Ubuntu 20.04

  gnome-control-center:
    Installé : 1:3.36.1-1ubuntu5
    Candidat : 1:3.36.1-1ubuntu5
   Table de version :
   *** 1:3.36.1-1ubuntu5 500
          500 http://be.archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status

  
  What I expected to happen, is that everything works and that I can set up my 
finger for unlocking.

  What happened instead : it crashes with the information "Unable to
  access device "Validity VFS0050"
  GDBus.Error:org.freedesktop.DBus.Error.NoReply:Message recipient
  disconnected from message bus without replying".

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: gnome-control-center 1:3.36.1-1ubuntu5
  ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30
  Uname: Linux 5.4.0-29-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia wl
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Tue May 12 22:00:30 2020
  InstallationDate: Installed on 2020-05-11 (1 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  ProcEnviron:
   LANGUAGE=fr_BE:fr
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_BE.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-control-center
  UpgradeStatus: No upgrade log present (probably fresh install)

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