Switching to iptables-nft from iptables

[dimus]

nftables is a modern implementation of firewall in Linux kernel, while iptables is the previous one. Some programs continue to use iptables, while others move to nft, and it does create a bit of a mess. I suggest to install iptables-nft instead of iptables. For ufw both are equally good, and all firewall rules in this case can be seen in one place with nft list ruleset while iptables rules will be transparently converted to nft while still keeping backward compatibility.