nmcli-device-status-unmanaged

症状：

nmcli device status

DEVICE        TYPE      STATE                                  CONNECTION
enp89s0       ethernet  unmanaged                              --         
lo            loopback  unmanaged                              --

检查/etc/NetworkManager/NetworkManager.conf，如果[ifupdown]里的managed是false，那就改成true：

[main]
plugins=ifupdown,keyfile

[ifupdown]
managed=true

然后重启服务：

sudo systemctl restart NetworkManager

然后就好了：

nmcli device status

DEVICE        TYPE      STATE                                  CONNECTION 
enp89s0       ethernet  connected (externally)                 enp89s0
lo            loopback  unmanaged                              --

参考：

https://askubuntu.com/questions/1115117/ubuntu-18-04-ethernet-not-managed

相关：

https://askubuntu.com/questions/882806/ethernet-device-not-managed

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/sec-configuring_ip_networking_with_nmcli