Ubuntu ethernet - UNCLAIMED error (intel)

first check your ethernet card

lspci -nnk | grep Eth

you should see something like

00:19.0 Ethernet controller [0200]: Intel Corporation Device [8086:1502] (rev 04)

now get the e100e driver from here

then :

tar -xf e1000e-1.2.20.tar.gz
cd e1000e-1.2.20/src
make install
modprobe e1000e

thats all.