Network Interfaces disabled, eth0 does not exist ( Ubuntu 16.04 LTS )

I'm trying to set up a dedicated server for the house, but I keep running into the trouble of having no connection!

I first found out I had no connection when I started to install the server. It reported that it could not connect to the DHCP server, so I set it to configure later, foolishly believing that I could fix it.

(All of these commands were done while in su mode.)
The first thing I did was to apt update to see if it detected the Ethernet after installation. It failed to fetch the files.
Then, I looked at lshw -C network to find that my Ethernet interface was disabled.
Finally, I took a check at ifconfig and saw that the device eth0 does not exist at all!

So, I tried creating it by adding auto eth0 / iface eth0 inet dhcp and restarting the networking service for the computer to complain that eth0 does not exist (even after restarting!).

This problem traveled with me over two motherboards, yet the ethernet cable works for my laptop (which has the same version - 16.04 LTS).

Please, please help me. I don't know what to do.

RIG:
​hostname: samserver
Ubuntu Server 16.04 LTS
Motherboard - ASUS H97-Plus
Ethernet - Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 11)

ifconfig

Code:

lo        Link encap:Local Loopback            inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:2256 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2256 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1 
          RX bytes:167920 (167.9 KB)  TX bytes:167920 (167.9 KB)


virbr0    Link encap:Ethernet  HWaddr 52:54:00:49:f3:01  
          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

/etc/network/interfaces

Code:

# This file describes the network interfaces available on your system# and how to activate them. For more information, see interfaces(5).


source /etc/network/interfaces.d/*


# The loopback network interface
auto lo
iface lo inet loopback

# Makes `service networking restart` crash
auto eth0
iface eth0 inet dhcp

lshw -C network

Code:

  *-network DISABLED       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: enp3s0
       version: 11
       serial: 9c:5c:8e:85:e1:bd
       size: 10Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:27 ioport:e000(size=256) memory:f7c00000-f7c00fff memory:f0000000-f0003fff
  *-network DISABLED
       description: Ethernet interface
       physical id: 1
       logical name: virbr0-nic
       serial: 52:54:00:49:f3:01
       size: 10Mbit/s
       capabilities: ethernet physical
       configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full link=no multicast=yes port=twisted pair speed=10Mbit/s

lspci | grep Ethernet

Code:

03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 11)

/etc/resolv.conf

Code:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

systemctl status networking.service (after service networking restart)

Code:

* networking.service - Raise network interfaces   Loaded: loaded (/lib/systemd/system/networking.service: enabled; vendor preset:enabled)
  Drop-In: /run/systemd/generator/networking.service.d
           L 50-insserv.conf-$network.conf
   Active: failed (Result: exit-code) since Sat 2016-07-30 21:23:25 PDT: 12s ago
     Docs: man:interfaces(5)
  Process: 1450 ExecStart=/sbin/ifup -a --read-environment (code=exited, status=1/FAILURE)
  Process: 1444 ExecStartPre=/bin/sh -c [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo): ] && udevadm settle (code=exited, status=1/FAILURE)
 Main PID: 1450 (code=exited, status=1/FAILURE)


Jul 30 21:23:25 samserver systemd[1]: Starting Raise network interfaces...
Jul 30 21:23:25 samserver sh[1444]: Unknown interface eth0
Jul 30 21:23:25 samserver ifup[1450]: Unknown interface eth0
Jul 30 21:23:25 samserver systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
Jul 30 21:23:25 samserver systemd[1]: Failed to start Raise Network interfaces.
Jul 30 21:23:25 samserver systemd[1]: networking.service: Unit entered failed state.
Jul 30 21:23:25 samserver systemd[1]: networking.service: Failed with result 'exit-code'.

journalctl -cx (after service networking restart)

Code:

---- Unit networking.service has begun starting up.
Jul 30 21:23:25 samserver sh[1444]: Unknown interface eth0
Jul 30 21:23:25 samserver ifup[1450]: Unknown interface eth0
Jul 30 21:23:25 samserver systemd[1]: networking.service: Main process exited, code=exited, status=1/FAILURE
Jul 30 21:23:25 samserver systemd[1]: Failed to start Raise Network interfaces.
-- Subject: Unit networking.service has failed
-- Defined-By: systemd
-- Support: http://ift.tt/13JGhYF
--
-- Unit networking-service has failed.
Jul 30 21:23:25 samserver systemd[1]: networking.service: Unit entered failed state.
Jul 30 21:23:25 samserver systemd[1]: networking.service: Failed with result 'exit-code'.

Thank you so much for your time.

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Network Interfaces disabled, eth0 does not exist ( Ubuntu 16.04 LTS )