当我在 ubuntu 上检查 ufw 状态时出现以下错误。
ufw status
[sudo] password for rock:
ERROR: problem running iptables: iptables v1.6.1: can't initialize iptables table `filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
我该怎么做才能修复它?