Whilst GNU/Linux tends to be free of viruses, one thing that is common to all platforms (GNU/Linux, Mac, Windows) are rootkits. The two apps that are available run via the Terminal, chkrootkit and rkhunter. Both are available via Synaptic Package manager. In respect of the latter I found something about changing Line 61 to do with Open SSH and can't find the link. Looking at the mailing list archive a recent post states it flags plumbwire (part of pipewire audio) as a potential threat). Clearly rkhunter has not had any major updates since 2018. One thing neither can do is inspect containerised applications such as snapd, flatpak and App Images as they are not integral to the system. The Register recently reported of an unknown security issue not picked up for 12 years with OpenSSH, something I never use (knowingly), which relates to remote access. Whilst there are no GUI applications (apart from Clam-Tk), Pear OS that went by the wayside had developed a 'Security GUI' which was absolutely brilliant, and not long after this innovation, PearOS by David Tavares, shut down. What rootkit hunters do is examine your system for rootkits based on what your system has installed. If you add new (APT) applications they will show up as false positives as they compare your system today against the snapshot that they took on first run. Whilst viruses cannot affect GNU/Linux because they need an .exe to run, it is possible that if you are not diligent with emails that could potentially hold a virus and you forward that to a friend or family member who is a Windows user you would soon fall out of favour. Good article here: