How to solve
Packages which are removed, but still have some files left on the systems, are called unpurged packages. For example, a changed configuration file might not be deleted by the package manager, to ensure you don't loose your customizations. However if you intended to remove a package fully, an additional step is needed to clean those files. This is "purging" and can be done with the dpkg command.
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Lynis is a technical security auditing tool for Unix flavors like Linux, macOS, AIX, Solaris, and *BSD. It is open source software and free to use. Typical usage include system hardening, compliance testing, and vulnerability scanning. The project has an active community, including development via GitHub.
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