Translate iptables to nftables

sudo bash -c "iptables-restore-translate -f iptables.up.rules > nftables.up.rules

Load rules

nft -f nftables.up.rules

For nftables no longer use "/etc/network/iuf-pre-up.d/", but modify "ExecStart" and "ExecReload" in "lib/systemd/system/nftables.service", or symlink the nftables.up.rules over "/etc/nftables.conf".