lcalc software package provides program for calculating with L-functions, 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 lcalc
lcalc is installed in your system.
Make ensure the lcalc package were installed using the commands given below,
$ sudo dpkg-query -l | grep lcalc *
You will get with lcalc package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Mathematics |
| Package | lcalc |
| Version | 1.23+dfsg-3+b1 [s390x], 1.23+d |
| Description | program for calculating with L-functions |
| Sub Section | Math |