I installed iptables and iptables-persistent in order to save the rules and apply them after reboot, however whenever I try to restore or save I get this errors:

1. with sudo netfilter-persistent save : usr/share/netfilter-persistent/plugins.d/15-ip4tables: 45: /usr/share/netfilter-persistent/plugins.d/15-ip4tables: /sbin/modprobe: not found


2. with sudo netfilter-persistent reload after reboot: the rules were not saved so it does not block with my rule: sudo iptables -I INPUT -p icmp --icmp-type 8 -i eno1 -j DROP


3. I've tried to save with iptables-save > /etc/iptables/rules.v4 && ip6tables-save > /etc/iptables/rules.v6 but it doesn't seem to add the rule, and after reboot


4. sudo iptables-restore < /etc/iptables/rules.v4 sends: Bad argument '[unsupported' Error occurred at line: 30

my Ubuntu version is 18, please help save rules after reboot

EDIT: my error on 2: /usr/share/netfilter-persistent/plugins.d/25-ip6tables: 45: /usr/share/netfilter-persistent/plugins.d/25-ip6tables: /sbin/modprobe: not found