ubuntu更新报错如下：
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| root@localhost:~# apt-get update
Err:1 http://us.ports.ubuntu.com/ubuntu-ports bionic InRelease
Temporary failure resolving 'us.ports.ubuntu.com'
Err:2 http://ports.ubuntu.com/ubuntu-ports bionic-security InRelease
Temporary failure resolving 'ports.ubuntu.com'
Err:3 http://ppa.launchpad.net/ondrej/php/ubuntu bionic InRelease
Temporary failure resolving 'ppa.launchpad.net'
Err:4 http://us.ports.ubuntu.com/ubuntu-ports bionic-updates InRelease
Temporary failure resolving 'us.ports.ubuntu.com'
Reading package lists... Done
W: Failed to fetch http://us.ports.ubuntu.com/ubuntu-ports/dists/bionic/InRelease Temporary failure resolving 'us.ports.ubuntu.com'
W: Failed to fetch http://us.ports.ubuntu.com/ubuntu-ports/dists/bionic-updates/InRelease Temporary failure resolving 'us.ports.ubuntu.com'
W: Failed to fetch http://ports.ubuntu.com/ubuntu-ports/dists/bionic-security/InRelease Temporary failure resolving 'ports.ubuntu.com'
W: Failed to fetch http://ppa.launchpad.net/ondrej/php/ubuntu/dists/bionic/InRelease Temporary failure resolving 'ppa.launchpad.net'
W: Some index files failed to download. They have been ignored, or old ones used instead.
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原因是dns没有配置，解决办法 加入dns服务器地址：
vi /etc/resolv.conf
添加
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| nameserver 202.96.134.133
nameserver 8.8.8.8
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如果提示只读，用sudo运行，即：
sudo vi /etc/resolv.conf
运行完重启系统解决
