參考 
https://askubuntu.com/questions/1039233/no-wired-connection-wired-unmanaged-ubuntu-18-04

最後是照這個解決

I had exactly the same problem, but then tracked down the following solution (via this article).

  1. Edit /etc/NetworkManager/NetworkManager.conf (needs to be done with sudo) changing the line managed=false to read managed=true
  2. Restart network manager with

    sudo service network-manager restart

 

 

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