The message in "dhcp error" makes me think about a broken/misconfigured router.
Furthermore there is this line in dmesg.log:

[   82.885456] sky2 eth0: Link is up at 10 Mbps, half duplex, flow
control rx

Can you attach the output of "ifconfig eth0" and the file
/etc/dhcp3/dhclient.conf

Can you try the following things and tell if it helps:
- set the router to full duplex
- lower the mtu "sudo ifconfig eth0 mtu 1436" or something lower
- remove the option interface-mtu in /etc/dhcp3/dhclient.conf

Thanks.

-- 
kernel release > 2.6.27-2
https://bugs.launchpad.net/bugs/274069
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