看了一下这两篇的文章,写的很好了
https://blog.csdn.net/mossan/article/details/80381679
https://blog.csdn.net/peyte1/article/details/80509056
在/etc/netplan下配置,配置完 netplan apply
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DNS配置
DNS还是使用resolv.conf
sudo vi /etc/resolv.conf