Install xfce4-messenger-plugin by entering the following commands in the terminal:
sudo apt update sudo apt install xfce4-messenger-plugin
Description:
Dbus messages plugin for xfce4-panel
Xfce4 Messenger Plugin for Xfce4 Panel is a plugin that listens DBus messages and displays received messages in panel and/or popup window, and maintains a log of received messages.
Homepage: http://goodies.xfce.org/
Version: 0.1.0-6build1
Section: universe/x11