[ubuntu] How to un-blacklist wifi driver?

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http://ubuntuforums.org – I was having trouble with a USB wifi adapter dongle so someone helped me to blacklist the driver for the built-in wifi on my laptop to avoid conflicts. All has worked well but now I want to use the built-in wifi again! I have no idea how to un-blacklist the driver, can anyone help me please? It would be handy to have a way to easily blacklist and un-blacklist the driver as required - any suggestions on that as my skill-level is fairly low? Thanks... (Hardware)