Can you provide your NetworkManager.conf as well as your
/etc/network/interface file? Normally these two files should look like

1. NetworkManager.conf:


2. interfaces:
auto lo
iface lo inet loopback

That is to say, have dnsmasq and ifupdown plugins enabled and set
[ifupdown] to "managed=false", at the same time don't include anything
other than "lo" in /etc/network/interfaces.

** Changed in: network-manager (Ubuntu)
       Status: New => Incomplete

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  NetworkManager does not manage wired connection

Status in network-manager package in Ubuntu:

Bug description:
  NetworkManager does not manage my wired eth0 connection, no matter how
  I set /etc/network/interfaces or

  Using ubuntu 16.04, /etc/network/interfaces only managed lo, and
  [ifupdown] section of NetworkManager.conf had set managed=false.

  With these same settings, after upgrading to ubuntu 16.10, eth0
  appears as unmanaged in nm-applet.

  If I modify /etc/network/interfaces and add

  auto eth0
  iface eth0 inet dhcp

  And set managed=true in NetworkManager.conf [ifupdown] section, eth0
  is still unmanaged despite it does get an IP from DHCP server.

  This is happening in my five computers (two laptops and three

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