I have what I think might be the same problem on a new installation of
Lucid (which I chose for LTS reasons).

After install, my AR8152 v1.1 wasn't available through NetworkManager.
After some investigation, I installed linux-backports-modules-wireless-
lucid-preempt to try to get a working atl1c module.  Then when I booted
into 2.6.32-30-preempt (which wasn't the default in GRUB), eth0 appeared
in NetworkManager.  Unfortunately, DHCP failed.

I tried manually setting IP information, which sort of worked.  When I
ping my gateway, some packets get there and back, but very few:

PING 10.34.55.1 (10.34.55.1) 56(84) bytes of data.
64 bytes from 10.34.55.1: icmp_seq=8 ttl=64 time=0.149 ms
64 bytes from 10.34.55.1: icmp_seq=50 ttl=64 time=1.35 ms
64 bytes from 10.34.55.1: icmp_seq=65 ttl=64 time=0.156 ms
^C
--- 10.34.55.1 ping statistics ---
69 packets transmitted, 3 received, 95% packet loss, time 68000ms
rtt min/avg/max/mdev = 0.149/0.554/1.358/0.568 ms

The same ethernet cable to the same gateway does perfect pings every
time from an older laptop running Fedora 13.

** Attachment added: "Output of lspci -nnvv on Tim's laptop running Lucid with 
linux-backports-modules-wireless-lucid-preempt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/754752/+attachment/2044252/+files/lspci-nnvv-tim

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https://bugs.launchpad.net/bugs/754752

Title:
  [driver: 'atl1c' ifindex: 2] When  I plug ethernet cable after system
  boot eth0 still down :(

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