"eth0" would mean you first ethernet card. You should have a "wlan0" in there also, since you do no that means it is not detecting you wireless card (the networking services). "lo" is you loopback device, it is used for stuff to communicate on your system. Say you are running a webserver and you open an internet browser on that computer you can type "127.0.0.1" to access that webserver directly without going through you LAN but another computer on your LAN would not be able to use that address. Anyways it looks like that second command is saying that the system detects the wifi card but not the networking services. You could try the command "ifconfig wlan0 up" but i do not think that is it in this case.