I have also the problem with two PC (Kubuntu  15.04) linked to the same router. 
Sometimes I have network after the boot, sometimes not.
I have found this message in dmesg when I have no network:
[    7.195372] systemd[1]: Job NetworkManager.service/start deleted to break 
ordering cycle starting with network.target/start

This bug is quite annoying. When there is this problem, I reboot the
machine.

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

Title:
  Not working network connection after boot

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