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My computer running Ubuntu 12.04 can't connect to a specific WiFi SSID, but it can connect to any other WiFi SSID except the specific WiFi SSID.

In addition, my Android phone can connect to my specific WIFI SSID,

I borrowed a computer with Windows 7 installed to do a test, it can also connect to my specific WiFi SSID.

I don't know why. It shouldn't happen like this and not a long time ago, I was able to connect to the specific WiFi SSID in Ubuntu 12.04. I don't know what I did to cause this problem.

More details: In Ubuntu 12.04, I can't find my WiFi SSID in the list of common WiFi SSID list, it should be there. But I can find my WiFi SSID in the hidden SSID list, I am sure that I didn't make the SSID hidden. More strangely, I tried to connect the hidden SSID in ubuntu and it can't connect to the specific WiFi SSID. One of the evidence is that I can find the specific WiFi SSID both in my Android phone and Windows system.

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what authentication are you using ? can you paste the output of the command in your question please ... "iwlist wlan0 scan YOURSID". This is assuming your device is wlan0. –  nixgadgets Sep 3 '13 at 4:32
@nixgadgets Sorry to respond it lately. I open a terminal and ifconfig. It only has etho0, etho1, lo and ppp0. It has no wlan0 or such like that. But the fact is that the computer can connect to the other WiFi SSID except the specific one, it works perfectly when it connect to the other WiFi. –  天羽美羽 Sep 3 '13 at 10:25
@Ramchandra Apte Thank your for your patient revision. –  天羽美羽 Sep 3 '13 at 10:27
@天羽美羽 nope, it took barely a minute or two and I earned two points through it :) –  Ramchandra Apte Sep 3 '13 at 14:34

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