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I am trying to install Ubuntu 12.04.4 LTS from a bootable disk. I followed the instructions word for word given here: http://www.ubuntu.com/download/desktop/install-desktop-long-term-support

The system is connected to the WiFi network available, and the Ubuntu installer verifies the same, yet when I click continue, I remains stuck there for long and then shows "disconnected from network", and furthermore, the listing of the wireless networks within range is not visible either.

There is absolutely no problem with my WiFi connection because I have other devices connected to it and running at ease. I later booted with Windows and there's no problem in connecting with the network, however this problem occurs again and again each time I try to install Ubuntu.

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Configuring wireless can be tricky for some devices. I usually connect with a cable to install and once I have installed, then I'll configure the wireless. In any case, we can't help unless you tell us which wireless card you have. Please post the output of sudo iwconfig and lspci | grep Net –  terdon Mar 13 '14 at 15:13

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