[ubuntu] external screen configuration - how do I...

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http://ubuntuforums.org – How do I change the display screen to an external monitor? I have an IBM ThinkPad X4 UltraBase laptop. It's elderly, but useful, works fine. It has a video port on the back. The BIOS Video settings are: Internal / PCI. I have changed them to no apparent effect. I have looked, although I'm not sure what I'm looking for, and could find only 'System Preferences Display' and I couldn't see anything relevant. (Hardware)