indicator-applet software package provides GNOME panel indicator applet, you can install in your Ubuntu 17.04 (Zesty Zapus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install indicator-applet
indicator-applet is installed in your system.
Make ensure the indicator-applet package were installed using the commands given below,
$ sudo dpkg-query -l | grep indicator-applet *
You will get with indicator-applet package name, version, architecture and description in a table
| Distro | Ubuntu 17 04 zesty zapus |
| Section | GNOME |
| Package | indicator-applet |
| Version | 12.10.2+17.04.20161122.2-0ubun |
| Description | GNOME panel indicator applet |
| Sub Section | GNOME |