*** This bug is a duplicate of bug 1676547 ***
    https://bugs.launchpad.net/bugs/1676547

I've experienced this bug in a clean install of 18.04 via the server
edition first then adding a GUI. In the past editing
/etc/NetworkManager/NetworkManager.conf and setting managed=true was the
solution, that doesn't work anymore. Instead, first I needed to create a
file under /usr/lib/NetworkManager/conf.d/10-globally-managed-
devices.conf and put the following text in it:

[keyfile]
unmanaged-devices=*,except:type:wifi,except:type:wwan

then copy that file to /etc/NetworkManager/conf.d/10-globally-managed-
devices.conf

and then edit the file /etc/NetworkManager/conf.d/10-globally-managed-
devices.conf and change the line to say unmanaged-devices=none

that is finally, at long last what solved it for me.

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https://bugs.launchpad.net/bugs/1638842

Title:
  network-manager does not manage ethernet and bluetooth interfaces when
  Ubuntu 16.10 is installed using chroot/netboot method

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