Updating wireless drivers in ubuntu

I am working on a Dell precision M4700 laptop with Ubuntu 12.04 and KDE desktop.After a "suggested" system updating, my wireless connection stops working.KNet Work Manager sees the wireless and tries to connect to it but, after a while, a small windows pops up and asks for a password.If I introduce the wireless one I have it tries again but nothing happens.

Click Activate to activate the driver and then, when prompted, enter your password and click Authenticate. Then, click Close once the changes have been applied.The window has the title "Secretas de [wireless name] - Service for KDE-" (in Spanish sorry :-)).I guess some security measurement has been activated after the updating but I do not know how to deactivate it.The Linux kernel includes open-source modules -- i.e.drivers -- for most hardware, and Ubuntu loads these modules from a boot archive called initramfs.Or do you want to wipe a drive in a computer that you are selling or giving away?

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