Wired network - device not managed after upgrade to 17.04 [duplicate]
As Zoltan Laczko mentioned, from NetworkManager 1.2.4 (ubuntu 16.10) all non-wifi/wwan device are treated as unmanaged (see his answer in a similar question Network Manager refusing to manage wired interfaces). A solution is to create an empty file:
sudo touch /etc/NetworkManager/conf.d/10-globally-managed-devices.conf
... that will overshadow/overwrite the one in /usr/lib and then restart the Network Manager.