Can you please attach your /etc/NetworkManager/NetworkManager.conf ? NM
is not supposed to create /etc/resolv.conf any more, so I suppose
something else is going on. Can you please reproduce the failed state
and then do

  cat /etc/resolv.conf

and copy&paste the output, and run

  journalctl -u NetworkManager.service -u systemd-resolved.service -b >
/tmp/nm.log

and attach /tmp/nm.log?

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

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1647133

Title:
  Network-manager 1.4.2-2ubuntu4 brakes network connection (Zesty)

Status in network-manager package in Ubuntu:
  Incomplete

Bug description:
  Network-manager will make my network connection immediately lost after 
updating to the newest version 1.4.2-2ubuntu4.
  However, downgrading to the previous version 1.4.2-2ubuntu3 the network 
connection is back again and fine. If, with this version, I remove the file 
(link) /etc/resolv.conf the network is broken again. Rebooting solves this, as 
network-manager creates a new resolv.conf file.

  The newest version 1.4.2-2ubuntu4 also creates the very same kind of
  file, but no network.

  I have the latest (Gnome-shell DE) updates installed and of course all 
packages that network-manager depends on. But not the ones it only recommends 
or suggests.
  Should I have resolvconf installed? I think not, as isc-dhcp-client only 
suggests it.

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