cloop-src software package provides Source of the compressed loopback device module, 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 cloop-src
cloop-src is installed in your system.
Make ensure the cloop-src package were installed using the commands given below,
$ sudo dpkg-query -l | grep cloop-src *
You will get with cloop-src package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Kernels |
| Package | cloop-src |
| Version | 3.14.1.2 |
| Description | Source of the compressed loopback device module |
| Sub Section | Kernels |