本文介绍了一种在Ubuntu上安装SSH服务时遇到的网络解析错误，并提供了解决方案，通过修改DNS设置，确保了SSH服务的顺利安装。
早上安装Ubuntu ssh出现异常
Err:1 http://security.ubuntu.com/ubuntu xenial-security/main amd64 openssh-sftp-server amd64 1:7.2p2-4ubuntu2.7
Temporary failure resolving ‘security.ubuntu.com’
Err:2 http://security.ubuntu.com/ubuntu xenial-security/main amd64 openssh-server amd64 1:7.2p2-4ubuntu2.7
Temporary failure resolving ‘security.ubuntu.com’
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-sftp-server_7.2p2-4ubuntu2.7_amd64.deb Temporary failure resolving ‘security.ubuntu.com’
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openssh/openssh-server_7.2p2-4ubuntu2.7_amd64.deb Temporary failure resolving ‘security.ubuntu.com’
我的解决方法如下：
echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf > /dev/null
sudo apt-get update
之后再安装SSH就没有问题
sudo apt install openssh-server
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