I'm a completely new to Ubuntu server and am having a hard time connecting the server to the internet.

I first ran ping -n 8.8.8.8

connect:Network is unreachable

Then I ran ifconfig

Link encap:Local Loopback
inet addr:127.0.0.1 Mask 255.0.0.0
inet6 addr: ::1/28Scope:host
UP LOOPBACK RUNNING MTU:16436
RX packets:192 errors:0 dropped:0 overruns:0 frame:0
TX packets:192 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0 RX bytes:15360 (15.2KB) TX bytes:15360 (15.3KB)

Here is ouput for sudo lspci -n

00:00.0 0600: 8086:2580 (rev 04)
00:02.0 0300: 8086:2582 (rev 04)
00:1d.0 0c03: 8086:2658 (rev 03)
00:1d.1 0c03: 8086:2659 (rev 03)
00:1d.0 0c03: 8086:265a (rev 03)
00:1d.0 0c03: 8086:265b (rev 03)
00:1d.0 0c03: 8086:265c (rev 03)
00:1e.0 0604: 8086:244e (rev d3)
00:1e.0 0401: 8086:266e (rev 03)
00:1f.0 0601: 8086:2640 (rev 03)
00:1f.0 0101: 8086:2651 (rev 03)
00:1f.0 0c05: 8086:266a (rev 03)
00:0b.0 0200: 8086:1654 (rev 03)

lshw-c network returns

WARNING: you should run this program as super-user.
*-network DISABLED
description:Ethernet interface
product: NetXtreme BCM5705_2 Gigabit Ethernet
vender: Broadcom Corporation
physical id:b
bus info:pci@0000:0a:0b.0
logical name: eth0
capabilities: bus_master_cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 

1000bt 1000bt-fd autonegotiation

configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion= 3.121 

firmware=5705-v3.18 latency=32 mingnt=64 multicast=yes port=twister pair

lsmod code returned this

Module              Size          Used By
e100                37213           0
dm_crypt            23125           1
ppdev               17113           0
psmouse             87603           0
snd_intel8x0        38570           0
snd_ac97_codec      134826          1 snd_intel8x0
ac97_bus            12730           1  snd_ac97_codec
snd_pcm             97188           2 snd_intel8x0, snd_ac97_codec
serio_raw           13211           0
snd_timer           29990           1  snd_pcm
snd                 78855           4 snd_intel8x0, snd_ac97_codec, snd_pcm,snd_timer
soundcore           15091           1 snd
snd_page_alloc      18529           2  snd_intel8x0, snd_pcm
ext2                73795           1
parport_pc          32866           1
mac_hid             13253           0
lp                  17799           0
parport             46562           3    ppdev, parport_pc,lp
usbhid              47199           0
hid                 99559           1 usbhid
tg3                 152032          0
i915                468651          1
floppy              70365           0
drm_kms_helper      46978           1 i915
drm                 242038 2 i915,drm_kms_helper
i2c_algo_bit        13423 1 i915
video               19596 1 i915

Again there is more but it's giving info on the driver itself. I know it works, I've used it. I assume then that my network got disabled when I installed Ubuntu Server. How do I enable it?

I checked and the internet cable is connected to the D-link router. I have also used this same computer for internet access when I had Ubuntu Desktop installed so internet does work.