Install docker by entering the following commands in the terminal:
sudo apt update sudo apt install docker
Description:
System tray for KDE3/GNOME2 docklet applications
Docker is a docking application (WindowMaker dock app) which acts as a system tray for any desktop environment, allowing you to have a system tray without running the KDE/GNOME panel Docker was designed to work with Openbox 2, but it should work fine in any window manager.
Version: 1.5-1build1
Section: universe/x11