Artful and Bionic are fine, since this was fixed in debian's 0.50-4:
chkrootkit (0.50-4) unstable; urgency=low
* [132754e] Fix windigo false positive (Closes:#796599)
The patch debian is using is
https://salsa.debian.org/pkg-security-team/chkrootkit/blob/debian/master/debian/patches/19_openss
** Changed in: chkrootkit (Ubuntu)
Status: Triaged => Fix Released
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https://bugs.launchpad.net/bugs/1508248
Title:
chkrootkit gives false positive Linux/Ebury - O
** Changed in: chkrootkit (Ubuntu Xenial)
Status: New => Confirmed
** Changed in: chkrootkit (Ubuntu Xenial)
Importance: Undecided => Low
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https://bugs.launchpad