root@shubham:~# iwconfig wlan0 mode monitor Error for wireless request "Set Mode" (8B06) : SET failed on device wlan0 ; Operation not supported.
Trying to change the mode of wlan0 from managed to monitor. Need some help.
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Not every wireless card and driver combination support monitor mode, particularly, most Broadcoms. If the command reports, "Operation not supported," I'm afraid that's what it means: it can't do it.
You can double-check from the terminal:
Here is a sample from my machine:
Supported interface modes: * IBSS * managed * AP * AP/VLAN * monitor * P2P-client * P2P-GO * P2P-device
If your result doesn't include monitor, then it simply isn't possible.
You could, of course, get a different wireless card.