coyim software package provides safe and secure XMPP chat client, 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 coyim
coyim is installed in your system.
Make ensure the coyim package were installed using the commands given below,
$ sudo dpkg-query -l | grep coyim *
You will get with coyim package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | coyim |
| Version | 0.3.7-2 |
| Description | safe and secure XMPP chat client |
| Sub Section | Net |