被Name or service not known问题困扰一天：
首先，检查VM的所有服务是否开启
win + R 输入services.msc，查看所有服务
然后，报错unable to resolve host address：无法解析主机地址，说明DNS出现问题
解决：
运行sudo vim /etc/resolv.conf。
添加如下内容
nameserver 8.8.8.8 #google域名服务器
nameserver 8.8.4.4 #google域名服务器
failed: Name or service not known. wget: unable to resolve host address Ubuntu报错解决
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