W:Failed to fetch http://security.ubuntu.com/ubuntu/dists/xenial-security/restricted/binary-arm64/Packages404 Not Found [IP: 91.189.88.162 80]
W:Failed to fetch http://security.ubuntu.com/ubuntu/dists
我在Ubuntu14.04上运行了一个KVM,NAT配置后面有几个客人(主要是CentOS7)。如果主机服务器中激活了以下防火墙规则,则客人似乎无法连接到internet连接:iptables -A INPUT -p tcp --dport 22 -j ACCEPTiptables -A INPUT -m state --state ESTA