Comment 7 for bug 987511

can you try with:

https://launchpad.net/ubuntu/+archive/primary/+files/linux-image-3.2.0-1415-omap4_3.2.0-1415.20_armhf.deb

also, from a command line execute:

cat /sys/class/net/eth0/carrier

and

sudo mii-tool eth0

(install the necessary tools in not already present)