下载Ubuntu 18.04 网络安装目录
wget -c -r -np -k -L -p http://archive.ubuntu.com/ubuntu/dists/bionic-updates/main/installer-amd64/current/images/netboot/
以下两个国内的地址此命令无效
wget -c -r -np -k -L -p https://mirrors.bfsu.edu.cn/ubuntu/dists/bionic-updates/main/installer-amd64/current/images/netboot/
wget -c -r -np -k -L -p http://mirrors.163.com/ubuntu/dists/bionic-updates/main/installer-amd64/current/images/netboot/
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