Mint 19 - rkhunter 1.4.6 won't update

System: Linux Mint 19 Cinnamon 64-bit, based on Ubuntu 18.04. RKHunter: packaged version 1.4.6-2. Unfortunately, when I try to update its database, I get error: ------------------------------ $ sudo rkhunter --update [ Rootkit Hunter version 1.4.6 ] Checking rkhunter data files... Checking file mirrors.dat [ Skipped ] Checking file programs_bad.dat [ Update failed ] Checking file backdoorports.dat [ Update failed ] Checking file suspscan.dat [ Update failed ] Checking file i18n versions [ Update failed ] Please check the log file (/var/log/rkhunter.log) ----------------------- I checked the log with no real result.