connman-ui software package provides Full-featured GTK-based tray icon UI for ConnMan, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install connman-ui
connman-ui is installed in your system.
Make ensure the connman-ui package were installed using the commands given below,
$ sudo dpkg-query -l | grep connman-ui *
You will get with connman-ui package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | connman-ui |
| Version | 0~20130115-1 |
| Description | Full-featured GTK-based tray icon UI for ConnMan |
| Sub Section | Net |