cloud-init software package provides initialization system for infrastructure cloud instances, 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 cloud-init
cloud-init is installed in your system.
Make ensure the cloud-init package were installed using the commands given below,
$ sudo dpkg-query -l | grep cloud-init *
You will get with cloud-init package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Administration Utilities |
| Package | cloud-init |
| Version | 0.7.6~bzr976-2 |
| Description | initialization system for infrastructure cloud instances |
| Sub Section | admin |