cgminer software package provides multi-threaded multi-pool Bitcoin miner, 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 cgminer
cgminer is installed in your system.
Make ensure the cgminer package were installed using the commands given below,
$ sudo dpkg-query -l | grep cgminer *
You will get with cgminer package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Network |
| Package | cgminer |
| Version | 4.9.2-1+b1 |
| Description | multi-threaded multi-pool Bitcoin miner |
| Sub Section | Net |