[ubuntu] Novice User Question. Wifi connection problem.

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http://ubuntuforums.org – Hello all. Happy to be here. I'm a novice, end user getting used Ubuntu on an old Dell Inspiron 1520. I've been running Ubuntu 13.04. with no problems when suddenly today I can no longer connect to my wifi. No help from the drop down menu from the wifi icon. And I restarted a couple times. Thanks for any leads on this. Best, Handala (Hardware)