crypto-dm-modules-4.7.0-1-amd6 software package provides devicemapper crypto 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 crypto-dm-modules-4.7.0-1-amd6
crypto-dm-modules-4.7.0-1-amd6 is installed in your system.
Make ensure the crypto-dm-modules-4.7.0-1-amd6 package were installed using the commands given below,
$ sudo dpkg-query -l | grep crypto-dm-modules-4.7.0-1-amd6*
You will get with crypto-dm-modules-4.7.0-1-amd6 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | debian-installer udeb packages |
| Package | crypto-dm-modules-4.7.0-1-amd6 |
| Version | 4.7.8-1 |
| Description | devicemapper crypto module |
| Sub Section | Debian-installer |
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