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Does "wlan0mon" mean my USB Wireless Adapter is in monitor mode?

I'm new to Kali Linux and using a USB Wifi adapter and I wanted to know if someone would be willing to confirm my results when...

Not sure if you had any success yet, but did you try to remove/reinstall the firmware driver?

apt-get remove firmware-<chipset> (e.g. Atheros)
apt-get install firmware-<chipset>

Think that is...