Same problem after upgrade from 14.04 to 16.04. (Dell Precision M4700)
After reboot, ifconfig displays IP address and all seems well. Connecting to 
local IP works, but internet fails.
I found another workaround by adding eth0 configuration to the 
/etc/network/interfaces, then, after reboot I stop the network manager: service 
network-manager stop
then: ifdown eth0
then: ifup eth0
and internet works. So, seems indeed a DNS problem.

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

Title:
  Not working network connection after boot

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