11.10 can't find my network

I upgraded my main system to 11.10 after some problems and asking some questions I got my system working but I couldn't get the network to go.

I have tried to set the IP addresses manually but that hasn't worked

It appears that 11.10 hasn't found the network card I'm not sure what to do to check that 11.10 has found the network card

Realtek R8111/8168B Network Card
On board Giga-Byte Motherboard
DSl Modem
DSL-502T
Network Switch
DGS-1008D

I have now spent many hours working on the system trying any suggestion I could find none have got the network to work. I'm currently updating my backups, then planning to do a reinstall from a Live CD.

Here are some of the functions I have tried.

lspci showed that the network exists

route I don't know what is missing or what should be there

I went to the realtek website and downloaded their drivers
that didn't do anything

I typed in this command
sudo lshw -C network;lsb_release -a; sudo rfkill list
This is the results
  *-network
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: eth0
       version: 03
       serial: 1c:6f:65:2d:0f:4e
       size: 10Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list rom 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=rtl_nic/rtl8168d-2.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:42 ioport:ce00(size=256) memory:fdfff000-fdffffff memory:fdff8000-fdffbfff memory:fdf00000-fdf1ffff
LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch
Distributor ID: Ubuntu
Description: Ubuntu 11.10
Release: 11.10
Codename: oneiric

so I'm now stuck I've been using Ubuntu since 8.04 and I like it. I want to use Ubuntu in the new business I'm starting which within 12 months will be needing over 1000 computers + Servers but this is not giving me the confidence I really need to recommend Ubuntu as the O/S for the business.

I really want to solve this problem but need some help

Cheers Tony