Install evolution-indicator by entering the following commands in the terminal:
sudo apt update sudo apt install evolution-indicator
Description:
GNOME panel indicator applet for Evolution
indicator-applet is an applet to display information from various applications consistently in the GNOME panel. . This package provides a plugin for Evolution that uses libindicate and libnotify to provide additional information about Evolution's state.
Homepage: https://launchpad.net/evolution-indicator
Version: 0.2.20-0ubuntu33
Section: universe/gnome