chkrootkit software package provides rootkit detector, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) 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 | Ubuntu 16 04 lts xenial xerus |
| Section | Miscellaneous |
| Package | chkrootkit |
| Version | 0.50-3.2 |
| Description | rootkit detector |
| Sub Section | Misc |