Ubuntu 虚拟机丢失网络图标的修复 - housekeeper-software/tech GitHub Wiki

sudo service network-manager stop
//停止NetworkManager
sudo rm /var/lib/NetworkManager/NetworkManager.state
//删除NetworkManager缓存文件
sudo service network-manager start
//再次启动NetworkManager
sudo gedit /etc/NetworkManager/NetworkManager.conf
//将 /etc/NetworkManager/NetworkManager.conf 文件中的false改为true
sudo service network-manager restart
// 最后重新启动