[ubuntu] No eth0

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http://ubuntuforums.org – After my friends computer kept crashing on windows, I decided to install ubuntu 12.04 on it as he only needs it for basic Internet connection. However, I can not get the computer to detect the ethernet cable. I have the same install on my computer, and it detects the cable and will automatically connect to the internet just fine. I did some searching on google for similiar problems and found out that it is not even detecting the ethernet port as when I try the command ifconfig -a the results are only: lo Link encap:Local Loopback inet addr: Mas (Hardware)