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[Roberto <roberto.arro@xxxxxxxxx>]

I have the same problem.
I added "systemctl restart NetworkManager.service¨ to "/etc/rc.local" to solv it temporarily

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https://bugs.launchpad.net/bugs/1583437

Title:
  Directly after boot there is no network

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  When doing a cold boot from a full power off, or a soft reboot, after
  gnome loads, I have no Internet connections. This happens without fail
  after every cold boot and intermittently after a soft reboot.

  It has occurred since ubuntu desktop 14.04 all the way up to 16.04. I
  only use kernels that is provided by unbuntu and only when the system
  tells me there is an update to them. I have no custom drivers
  installed, all drivers are from the kernel minus the nivida drivers,
  but it does this even when i dont use the proprietary drivers from
  nvidia.

  The fix for the problem is to soft reboot multiple times until it
  corrects itself. I have done many search's and tried several options,
  none have corrected the problem.

  Im currently using ubuntu desktop 16.04 (gnome)

  below is a copy of dmesg from one of the network failed boots. Let me
  know if there is anything else I can provide to assist.

  http://pastebin.com/84mqSUuW

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-22-generic 4.4.0-22.40
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  sysx       1813 F.... pulseaudio
   /dev/snd/controlC0:  sysx       1813 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Thu May 19 00:09:47 2016
  HibernationDevice: RESUME=UUID=73058683-1e8a-4e97-9b1b-e34e7f4a5511
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  ProcEnviron:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-22-generic root=UUID=ede95eeb-fd81-4883-bfe1-6d2cb0567e66 ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-22-generic N/A
   linux-backports-modules-4.4.0-22-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/24/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: FC
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: 990FXA-UD5
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrFC:bd06/24/2015:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rn990FXA-UD5:rvrTobefilledbyO.E.M.:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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