Ubuntu版本20.04，突然今天使用的时候一直显示网络连接失败，然后网页打不开，也ping不同。尝试各种博客上的方法都没有成功。
最后尝试恢复默认网络连接，问题解决
具体步骤如下：
1.找到->编辑->虚拟网络编辑器
2. 点击->更改设置
3.单击->还原默认设置
4. 重启虚拟机发现网络可以连接
Ubuntu网络连接失败（connection failed Activation of network connection failed）
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