参考文章: https://www.jianshu.com/p/921...

如果呈现 Err:2 http://security.ubuntu.com/ub... focal-security InRelease
Temporary failure resolving 'security.ubuntu.com' 问题

间接执行这个命令

echo  "nameserver  8.8.8.8"  >  /etc/resolv.conf