jellyfish software package provides count k-mers in DNA sequences, 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 jellyfish
jellyfish is installed in your system.
Make ensure the jellyfish package were installed using the commands given below,
$ sudo dpkg-query -l | grep jellyfish *
You will get with jellyfish package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Science |
| Package | jellyfish |
| Version | 2.2.6-1+b1 |
| Description | count k-mers in DNA sequences |
| Sub Section | Science |