This might be related:

Not working network connection after boot
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1434986

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https://bugs.launchpad.net/bugs/1566987

Title:
  No internet connection through WLAN although connected to network

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  In a fresh install of Kubuntu 16.04 on a ThinkPad t460s, I can connect
  wireless to the local WLAN, but I don't have an internet connection. A
  ping to the router doesn't work in that case.

  After some minutes, the connection usually (but not always) works.

  A LAN connection through the same router works, too. It seems that the
  problem doesn't occur in every WLAN, but in my home network (using an
  O2 box) it always does.

  The problem is reproducible with a Kubuntu Live CD/USB.

  The following steps did not solve the problem:

  - Reconnect to WLAN
  - Using kernel 4.6 or 4.7 
  - Restarting NetworkManager and networking service

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