gufw software package provides graphical user interface for ufw, 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 gufw
gufw is installed in your system.
Make ensure the gufw package were installed using the commands given below,
$ sudo dpkg-query -l | grep gufw *
You will get with gufw package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Administration Utilities |
| Package | gufw |
| Version | 12.10.0-1 |
| Description | graphical user interface for ufw |
| Sub Section | admin |
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