Iptables v1.8.4 (nf_tables): Could not fetch rule set generation id: Invalid argument

If you try to enable ufw firewall, get this error: Iptables v1.8.4 (nf_tables): Could not fetch rule set generation id: Invalid argument

CT (Ubuntu Ubuntu 22.04.2 LTS)  on proxmox 7

Fix:

 	apt install iptables
 	update-alternatives --set iptables /usr/sbin/iptables-legacy
 	update-alternatives --set ip6tables /usr/sbin/ip6tables-legacy
        apt-cache policy nftables

If nothing works, then run:

ufw reset

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