Ubuntu and Debian Linux use Linux Rootkit command to update and manage their RPM packages.
Malware called Linux rootkits is placed in the operating system as kernel modules. As soon as they are installed, they start to intercept normal Linux operations and filter out data that they do not want to be seen, including the existence of files, folders, or processes.
Over the years, Linux rootkits have changed in order to evade detection. For instance, some of the first Linux rootkits weren't really rootkits at all; rather, they were just a collection of backdoored commands that would shield a system administrator from discovering a malicious process, shell, file, etc.
The default installation of chkrootkit in Linux is absent. or you can clone the Git repository to instal it. Go to that directory after that and launch chkrootkit. This command initiates the system's search for rootkits.
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