Today I installed Ubuntu 18.10 and ran rkhunter on it. At first it said that there are 4 possible rootkits, but after second check it detected 7. During checking there was everything green and ok, except one warning:
Checking for suspicious (large) shared memory segments [ Warning ]
But I don't think that this would cause rkhunter's suspicion that there are some rootkits, would it? Or is it possible that I really got any rootkit even though there was no red "found" at any of those "known rootkits" check?
There is the output from the last check:
System checks summary ===================== File properties checks... Files checked: 149 Suspect files: 0 Rootkit checks... Rootkits checked : 479 Possible rootkits: 7 Applications checks... All checks skipped
Edit: I tried to install Fedora instead of Ubuntu and everything seems fine, even that warning is no longer here. So maybe Fedora somehow fixed that warning, thus rkhunter doesn't think that there is any danger whatsoever, not sure.