sudo service network-manager stop
sudo rm /var/lib/NetworkManager/NetworkManager.state
sudo service network-manager start
sudo gedit /var/lib/NetworkManger/nm-system-settings.conf
把里面的false改成true
就是下面内容：
[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=false
改成：
[main]
plugins=ifupdown,keyfile
[ifupdown]
managed=true
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