anki_libunity is an Anki add-on that shows the number of remaining cards to study and the correspondent progress bar at Anki launcher on your dock/panel using libunity specification.
It works only on Linux with the panels/docks that support libunity such as KDE Plasma or Dash to Dock extension for GNOME.
Also, it displays notifications when the number of cards to study increases. For example, when there are new due cards.
Please check the official add-on web page: https://ankiweb.net/shared/info/901237400
If your Anki's desktop file is not named net.ankiweb.Anki.desktop, then please change the application name in the add-on's config. It is used to find the Anki launcher and the Anki icon (for notifications).