[lubuntu] Can't seem to get a connection with Ethernet

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http://ubuntuforums.org – Hmmm. I've bee working on some LAN issues here in our small office. I've wanted to use this little laptop to ping at and dink with hosts on the LAN, but when I shut off Wireless (wlan0) and connect an Ethernet cable to the port, I get nothing. There's no indication that the laptop is using the wired connection. What are the steps I should take to troubleshoot this issue? (Hardware)