====== Pulseaudio ======
===== Pulse audio started multiple times =====
In journalctl shows some warnings that are the result of the fact that pulseaudio is started multiple at boot and user login. After analyzing I have identified the following locations which start pulseaudio:
 
=== Systemd user service ===
  $ systemctl --user is-enabled pulseaudio.socket
  enabled
  $ systemctl --user is-enabled pulseaudio.service
  enabled

=== XDG autostart ===
   ls /etc/xdg/autostart/*pulse*
   cat /etc/xdg/autostart/pulseaudio.desktop
   
=== XFCE session startup ===
   cat ~/.config/autostart/*pulse*
   
~/.config/autostart/pulseaudio.desktop. This file is created and set (hidden=true/false) by (un)checking XFCE -> Session and Startup -> PulseAudio at startup

=== D-Bus Activation Mechanism ===
D-Bus service file: There's a D-Bus service file that tells D-Bus how to start PulseAudio when something requests it:
  /usr/share/dbus-1/services/pulseaudio.service
  /usr/share/dbus-1/services/
  /usr/share/dbus-1/system-services/

  [D-Bus Service]
   Name=org.pulseaudio.Server
   Exec=/usr/bin/pulseaudio --start --log-target=syslog

Automatic activation: When an application tries to connect to PulseAudio via D-Bus (requesting the org.pulseaudio.Server service), D-Bus automatically launches PulseAudio if it's not already running.