Can I see the result of ifconfig BEFORE starting mana, and the contents of start-nat-simple.sh and hostapd-mana.config please? And the results of the command iw list.
Can I also see a screenshot of Kali’s network settings please?
So just right click the Kali machine in Virtual Box >> Setting >> Network, take a screenshot and post it here please.
Also can you please give me the exact model of your adapter?