When I initially installed Ubuntu...I told it to use my D-Link 650+ wireless as the default network connection. That is all fine while I am using the laptop at home but when I got to the office this morning...I needed it to use the onboard network adapter at eth0. During the boot sequence, it got to the point where it was bringing up the network interfaces. It started spitting errors in relation to eth0...something about unable to set multicast or something along those lines. It eventually booted up to the desktop and I logged in. I opened a terminal and typed in ifconfig...it sees a network card at eth0 and gives the MAC address and even gives an IPv6 IP address...but no IPv4 address is listed. Is this an instance where I need to setup a profile for home and a profile for work? If so...how do I do that?....