In a tutorial published by Linux Capable, you can learn how to set up Chkrootkit on Ubuntu 20.04 or 22.04.

How to Install Chkrootkit on Ubuntu 22.04 | 20.04

Learn how to install and use chkrootkit on Ubuntu 22.04 and 20.04. Our guide covers both methods of installing, from apt package manager to compiling from source. Perform regular scans, schedule checks, and detect rootkits with ease on your Ubuntu Linux system

How to Install Chkrootkit on Ubuntu 22.04 | 20.04 - LinuxCapable