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[cethru <1434986@xxxxxxxxxxxxxxxxxx>]

Had the same problem: NM was hanging after system start and i had no nm-
applet and no network connection.

Solution for me on Ubuntu 15.10, wired lan, manually entered network configuration was:
sudo killall NetworkManager
sudo service NetworkManager start
sudo reboot

Shouldn't systemd start NM?

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https://bugs.launchpad.net/bugs/1434986

Title:
  Not working network connection after boot

Status in NetworkManager:
  Confirmed
Status in network-manager package in Ubuntu:
  Triaged

Bug description:
  Directly after boot the network connections are not working. I am
  connected and have an IP address, but I cannot establish a connection
  with any Internet server.

  I have the impression it is related to thee DNS lookup, which waits
  forever for a result.

  Cycling the connection (disconnect->reconnect) seems to fix the
  problem for some time.

  I am reporting this against network-manager, but I am not sure if it is directly in network manager or if it is systemd related.
  With 14.10 everything worked perfectly.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager 0.9.10.0-4ubuntu11
  ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
  Uname: Linux 3.19.0-9-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.16.2-0ubuntu4
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Sun Mar 22 12:38:26 2015
  EcryptfsInUse: Yes
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2015-01-30 (50 days ago)
  InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  IpRoute:
   default via 192.168.1.1 dev eth0  proto static  metric 1024 
   169.254.0.0/16 dev wlan0  scope link  metric 1000 
   192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.26 
   192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.29
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to vivid on 2015-03-19 (3 days ago)
  modified.conffile..etc.NetworkManager.NetworkManager.conf: [modified]
  mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2015-02-16T00:14:50.662693
  nmcli-dev:
   DEVICE  TYPE      STATE      DBUS-PATH                                  CONNECTION                 CON-UUID                              CON-PATH                                           
   eth0    ethernet  connected  /org/freedesktop/NetworkManager/Devices/2  Kabelnetzwerkverbindung 1  4a581685-6002-4401-a993-49aa649667eb  /org/freedesktop/NetworkManager/ActiveConnection/4 
   wlan0   wifi      connected  /org/freedesktop/NetworkManager/Devices/1  4A616E7320574C414E         f45aa3a7-fb44-41b7-a02a-ea9720d79414  /org/freedesktop/NetworkManager/ActiveConnection/3 
   lo      loopback  unmanaged  /org/freedesktop/NetworkManager/Devices/0  --                         --                                    --
  nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'.

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