At this link there is a tricky and not always working solution to activate a wifi-hotspot using wifi.
Does someone know any program (like Connectify for Windows) that does this? I understand this question is widely present in all ubuntu websites but I hope some good guy that knows the answer would like to answer us :)
The matter is create a wifi hotspot using the same wireless device connected to wifi. In windows Connectify and other software do this smoothly.