First set your Wireless Interface to Monitor Mode using command :
airmon-ng start <interface>
Example :
airmon-ng start wlan0
To see what's your interface run iwconfig. If the output looks like this when run airmon-ng :
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Run : airmong-ng check kill
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After that run iwconfig to check if Monitor Mode Enabled
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After everything goes well let's run airodump-ng to see available Wireless Network :
airodump-ng wlan0
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