(Sorry I've tried suggestions made in related threads but no joy)
I have a new desktop (Haswell i5-4430 with Asrock Z87 Pro3 motherboard) on which I've installed Ubuntu 12.04.02. However the Ethernet connection doesn't seem to be recognized: attempts to enable networking result in the error message "Network disconnected - you are now offline". The hardware was tested on a Windows system before I got it and Ethernet was working.
Any help would be much appreciated.
Some diagnostics:
cat /etc/network/interfaces
auto lo
iface lo inet loopback
iface eth0 inet dynamic
ifconfig -a
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:16436 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:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
pan0 Link encap:Ethernet HWaddr ee:0a:87:0b:aa:60
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:0
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
lshw -class network
WARNING: you should run this program as super-user.
*-network UNCLAIMED
description: Ethernet controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
version: 04
width: 32 bits
clock: 33MHz
capabilities: bus_master cap_list
configuration: latency=0
*-network DISABLED
description: Ethernet interface
physical id: 2
logical name: pan0
serial: ee:0a:87:0b:aa:60
capabilities: ethernet physical
configuration: broadcast=yes driver=bridge driverversion=2.3 firmware=N/A
multicast=yes
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