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I'm new to Ubuntu but I'm trying to get hang of it for a while now, been trying to install aircrack-ng on the 12.04 LTS but I'm stuck now. This is a snapshot of where my problems got started. Please help me with all options possible. If I should start everything all over, let me know with a vivid step-by-step procedure. I will be very grateful for the help.

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You did not put your wireless card into monitor mode, you misspelt wlan0 and typed wlann0 instead. As a result, the monitor interface mon0 was not created.

So, do airmon-ng start wlan0.

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