1、删除NetworkManager缓存文件
service NetworkManager stop
sudo rm /var/lib/NetworkManager/NetworkManager.state
service NetworkManager start
2、修改/etc/NetworkManager/NetworkManager.conf
managed=true
3、重启NetworkManager
sudo service network-manager restart
原文：https://www.cnblogs.com/zhaihongliangblogger/p/14696367.html