ubuntu总是莫名其妙上不了网

最简单粗暴的方案：重启
尝试过的其他方案：
1.
sudo service network-manager stop
sudo rm /var/lib/NetworkManager/NetworkManager.state
sudo service network-manager start

2.https://blog.csdn.net/mimica247706624/article/details/78184194
https://www.cnblogs.com/zeze/p/5977590.html
https://www.linuxidc.com/Linux/2017-11/148587.htm
http://www.cnblogs.com/rivsidn/p/9298827.html