Could not resolve host:

报错如下：
root@ubuntu:~# apt-get update
Err:1 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial InRelease
  Could not resolve host: mirrors.tuna.tsinghua.edu.cn
Err:2 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-updates InRelease
  Could not resolve host: mirrors.tuna.tsinghua.edu.cn
Err:3 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-backports InRelease
  Could not resolve host: mirrors.tuna.tsinghua.edu.cn
Err:4 https://mirrors.tuna.tsinghua.edu.cn/ubuntu xenial-security InRelease
  Could not resolve host: mirrors.tuna.tsinghua.edu.cn
Reading package lists... Done
W: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial/InRelease  Could not resolve host: mirrors.tuna.tsinghua.edu.cn
W: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-updates/InRelease  Could not resolve host: mirrors.tuna.tsinghua.edu.cn
W: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-backports/InRelease  Could not resolve host: mirrors.tuna.tsinghua.edu.cn
W: Failed to fetch https://mirrors.tuna.tsinghua.edu.cn/ubuntu/dists/xenial-security/InRelease  Could not resolve host: mirrors.tuna.tsinghua.edu.cn
W: Some index files failed to download. They have been ignored, or old ones used instead.

原因：没有DNS
解决：/etc/resolv.conf里面添加对应得DNS.

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