Someone advised me to install a program called rkhunter for security. I've tried to do so, just using the apt command at the terminal, but am presented with a weird message about e-mail servers.
I have no idea what any of these options mean and so haven't dared to select any in case I gum up my Internet connection or something. What should I select?
It's possible that some other package called postfix, which was a required package that installed along with rkhunter, might be behind this rather than rkhunter itself. The word "postfix" appears on the menu.
Annoyingly, not only can I not get rkhunter going until this is completed, but it appears that dpkg is gummed up until it's completed and I can't install or uninstall anything else either!
Whenever I try to run, for instance, apt install, the terminal shows an error message referring to dpkg. After this has happened once or twice, it shows a different error message suggesting running "dpkg --configure -a".
When I do that, dpkg appears to sort itself out, but then, when I try to use apt install again (for any package), it goes back to trying to install rkhunter, scrolling through the usual "X% complete" messages and then displaying the cryptic menu, which cannot be closed until it is answered!
