No Wired or Wireless Connection on my Freshly Installed Ubuntu 12.4 LTS

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http://askubuntu.com – Let me start off by saying that I've been working on this for 6 hours, researching everywhere I can find online and not finding a solution. I just installed Ubuntu 12.4 LTS and replaced Windows XP on my Dell Precision M4300. The installation went smooth, however now that it's installed I'm unable to get any type of internet connection; wired or wireless. I've tried plugging directly into the modem, but the "Wired Icon" in the status bar constantly searches for a connection, disconnects, and instantly retries; non-stop. It never connects. I'm able to get a "connection" if I change the IPv4 co (HowTos)