Ethernet Connection Speed Not Configuring Properly on Dell Optiplex 740 with Ubuntu

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http://www.linuxquestions.org – Hey guys, I'm having a bit of an issue with my computer. I just recently installed Ubuntu on one of my household computers, and I'm having an issue with my Ethernet Connection. I have broadband internet which is run directly to a 24 Port Ethernet Key, which is in turn connected directly to my Modem. My internet connection is rated at 100 Mbps. When I plug my Ethernet cable into the computer, the connection status says it's connected, but at 1000 Mbps, and the connection does not actually work. I have another computer, a Dell Dimension 8300, which had used that same cable before with no issues. (HowTos)