Internet won't work wired or wifi - Ubuntu 12.04

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http://askubuntu.com – I just installed Ubuntu 12.04 on my Dell Inspiron 1520. It used to have Windows but it crashed and I didn't want to pay for Windows again so I am trying to figure out Linux. After logging in, I am unable to connect to the internet at all. When the Ethernet cable is plugged in, I cannot connect to the internet. In the System Settings -> Network, there are no wired or wireless options listed for me to connect to. Other machines in my house can connect directly to the LAN and wireless so I know the internet is working. I have tried restarting the machine with the WiFi switch in the on and off (HowTos)