chkrootkit software package provides 0.50-3, 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 chkrootkit
chkrootkit is installed in your system.
Make ensure the chkrootkit package were installed using the commands given below,
$ sudo dpkg-query -l | grep chkrootkit *
You will get with chkrootkit package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Miscellaneous |
| Package | chkrootkit |
| Version | 0.50-3 |
| Description | 0.50-3 |
| Sub Section | Misc |