Ubuntu – Ethernet device not managed


I am using Ubuntu 16.10 and recently I have not been able to connect to internet using Ethernet. The network manager shows device not managed.
The WiFi network is working fine.

enter image description here

enter image description here

I've tried the solution from this questionn Ubuntu 16.04 Ethernet issues
with no use.

My /etc/network/interfaces file:

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

My /etc/NetworkManager/NetworkManager.conf file:



Output of nmcli d:

wlp2s0  wifi      connected  eduroam    
enp8s0  ethernet  unmanaged  --         
lo      loopback  unmanaged  --   

Best Answer

  • The following bug in Ubuntu 16.10 might be related: network-manager does not manage ethernet and bluetooth interfaces when Ubuntu 16.10 is installed using chroot/netboot method

    First try running the following command:

    sudo nmcli dev set enp8s0 managed yes

    If you get the error message:

    Error: Device 'enp8s0' not found.

    Try running the command below:

    ip link show

    and look for a device name similar to enp8s0 and substitute it in the original command.

    If the that didn't solve the problem, try running the following (backup orig file, and create 0 bytes file instead)

    sudo mv /etc/NetworkManager/conf.d/10-globally-managed-devices.conf  /etc/NetworkManager/conf.d/10-globally-managed-devices.conf_orig
    sudo touch /etc/NetworkManager/conf.d/10-globally-managed-devices.conf  

    @datka reported a different location for The file 10-globally-managed-devices.conf so the commands should be:

    sudo mv /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf  /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf_orig
    sudo touch /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf

    The reboot, or restart the Network Manager service:

    sudo systemctl restart NetworkManager

    or the old way:

    sudo service network-manager restart