Paul Cartwright wrote:
dpkg --list rkhunter shows: ii rkhunter 1.3.2-6 rootkit, backdoor, sniffer and exploit scann
This is the one in /usr/bin, but it's the one in /usr/local/bin that seems configured as "the one to use", as shown by the output of "which" and the crontab's content. Maybe some (mis|old ) configuration of alternatives? Try this check:
update-alternatives --list rkunter
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