Ubuntu – Ethernet connection Issues on Ubuntu 16.04


Let me preface this by saying that I've taken a look at the other ethernet & 16.04 issues on here and believe mine to be different.

I'm having issues connecting to the internet on a new installation of Ubuntu 16.04. I have an ethernet connection running to my desktop computer and am able to establish an internet connection via a separate operating system on the same machine. The motherboard doesn't have a WiFi card.

Here's the output from ifconfig:

shloosh@Desktop:~$ ifconfig
  Link encap:Ethernet  HWaddr e0:3f:49:7f:db:f5  
  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)

  Link encap:Local Loopback  
  inet addr:  Mask:
  inet6 addr: ::1/128 Scope:Host
  UP LOOPBACK RUNNING  MTU:65536  Metric:1
  RX packets:804 errors:0 dropped:0 overruns:0 frame:0
  TX packets:804 errors:0 dropped:0 overruns:0 carrier:0
  collisions:0 txqueuelen:1 
  RX bytes:61616 (61.6 KB)  TX bytes:61616 (61.6 KB)

enp2s0 is the interface name that Network Manager assigned to the ethernet connection. I find it strange that it doesn't have an inet addr assigned.

And lshw:

shloosh@Desktop:~$ lshw -C network 
   description: Ethernet interface
   product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
   vendor: Realtek Semiconductor Co., Ltd.
   physical id: 0
   bus info: pci@0000:02:00.0
   logical name: enp2s0
   version: 09
   serial: e0:3f:49:7f:db:f5
   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=half firmware=rtl8168f-1_0.0.5 06/18/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
   resources: irq:26 ioport:e800(size=256) memory:fbfff000-fbffffff memory:fbff8000-fbffbfff

And my /etc/network/interfaces file:

shloosh@Desktop:~$ cat /etc/network/interfaces
# This file describes the network interfaces available on your system
# and how to activate them.
# interfaces(5) file used by ifup(8) and ifdown(8)

# The loopback network interface
auto lo
iface lo inet loopback

And lspci:

shloosh@Desktop:/etc$ lspci -nnk | grep -e 0200 -e 0280 -A2
02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 09)
Subsystem: ASUSTeK Computer Inc. P8 series motherboard [1043:8505]
Kernel driver in use: r8169

And finally lsmod:

shloosh@Desktop:~$ lsmod | grep r816*
r8169                  81920  0
mii                    16384  1 r8169

My routing table is empty. I'm new to Network Manager and fairly new to networking and am at a loss as to how to proceed. Any advice is appreciated.

Best Answer

You need to install the r8168-dkms using Synaptic.

Start Synaptic from the dash. Click the Reload icon. Type r8168-dkms into the searchbox. Only 1 item will be displayed in the results box, below. Mark it for Install. Click the Apply icon to install it. Reboot the computer.

Keep us posted. Cheers, Al

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