arduinoTime:
then she tried but couldn't so she tried 'ipconfig /release, ipconfig /flushdns' and 'ipconfig /renew' and now she can also connect.
I bet that's a coincidence, and it won't work the next time.
Signature check failed.
Remove wrong Signature file.
That can happen if your Yun doesn't actually have access to the Internet, or if the Yun's clock is not set properly.
i can configure the arduino but I cannot see it in the port of the arduino software
Yep, I didn't think that trick would work the next time... 