wired device not managed

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sudo vim /etc/NetworkManager/NetworkManager.conf 

change managed=true

sudo service network-manager restart

cp /etc/network/interfaces /etc/network_interfaces_backup
sudo cp /etc/network/interfaces /etc/network_interfaces_backup
sudo vim /etc/network/interfaces

delete everthing in file and copy follow content:

auto lo
iface lo inet loopback

sudo service network-manager restart

转载于:https://my.oschina.net/leonardtang/blog/841443