Ubuntu not picking up wireless networks [Ubuntu 12.10]

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http://askubuntu.com – i am new to Ubuntu & just installed it on my HP mini laptop, when i open the network tab it does not show the wireless networks around me, neither does it show mine, i have enabled networking but it still does not pick up any wireless. I am pretty sure my wireless network is not hidden, since i can connect to it on my other laptop, anyone have any idead on what i could be? It worked once when i was running Ubuntu on my USB, but when i installed it to the hard drive as a main OS it did not list any wireless networks. (HowTos)