Network interface down after every reboot in Ubuntu 15.10

I know this is old, just had the same problem myself, after install if you had no network plugged in it defaults the NIC to down after every restart.

/etc/netplan/00-installer-config.yaml replace eno1 with NIC tag, for example: ens255f0

network:
  ethernets:
    eno1:
      dhcp4: true
    eno2:
      dhcp4: true
  version: 2

reboot after done, this fixed two servers I had installed OS off network.

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