libjack-jackd2-0 software package provides JACK Audio Connection Kit (libraries), you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libjack-jackd2-0
libjack-jackd2-0 is installed in your system.
Make ensure the libjack-jackd2-0 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libjack-jackd2-0 *
You will get with libjack-jackd2-0 package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Libraries |
| Package | libjack-jackd2-0 |
| Version | 1.9.10+20140719git3eb0ae6a~dfs |
| Description | JACK Audio Connection Kit (libraries) |
| Sub Section | libs |