After searching questions, forums, guides, I could find any solutions that would fit the average Joe... Being Ubuntu, Linux for humans, I'll ask the question once again, trying to adjust the best answer so that anyone could use it.
I plug a ethernet cable on eth0 and it doesn't appear on the network manager as a connection. I use Ubuntu 14.04
lspci -nn
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 02)
ifconfig eth0
eth0 Link encap:Ethernet Endereço de HW 00:00:00:00:00:00
BROADCAST MULTICAST MTU:1500 Métrica:1
pacotes RX:0 erros:0 descartados:0 excesso:0 quadro:0
Pacotes TX:0 erros:0 descartados:0 excesso:0 portadora:0
colisões:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
I'm a newbie, so help me, helping you helping me. =) How can i debug this furthermore?
sudo apt-get install linux-firmware-nonfree wicd wicd-gtk wicd-daemon wicd-cli wicd-curses
. Update the results.