After using the terminal,wireless connection is gone

Yesterday I was looking online to see ''how can I transfer pictures,files from my Nexus 7 tablet to my desktop computer with the usb cable''..
I've found several support forums like this one I'm using right now,someone has already asked a question like mine so I followed the best answer,
I typed the commands in the terminal as the helper suggested,then I restarted my desktop pc,after that it didn't connect any more,it connects wireless usually,but since yesterday no connection:(
I still have the page/link that shows the answer I've followed (the top one) :
http://askubuntu.com/questions/207569/how-do-i-connect-a-nexus-7-to-transfer-files
thank you!!

Hello mediterranean,
Thank you for contacting Mozilla Support. Are you having trouble getting a wireless connection on your Ubuntu machine? This is probably not the best forum for Ubuntu or Nexus 7 questions, but you might try taking a look at this article:
http://askubuntu.com/questions/247993/cant-connect-to-any-wireless-connection-after-updating
Cheers,
Patrick

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