[ubuntu] Laptop screen plus 2 monitors

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http://ubuntuforums.org – Hello! I'm looking for a bit of help getting a 3 monitor set up using Ubuntu 11.04, I have a (64-bit) DELL Latitude e6420 - specs - The graphics card is an 'Intel® HD Graphics 3000'. I can use the VGA port to add an additional monitor, but I would like to add a further monitor. I have an HDMI port, but adding a monitor on this doesn't work. I have also borrowed a USB graphics card which I couldn't get working at all - if I booted up with this plugged in then I got nothing on the other two monitors. Any suggestions as to how I can get this setup working? Is there a particular USB card (Hardware)