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wpa_supplicant is most likely your error. Wifite is worse, it will attack your network if you don't pay attention.

If you create a partition and put the EFI flag in it the Grub will install there. Otherwise it's anyone's guess where it will go. Their installation protocol needs a little work.

Use the ifconfig command. You could also run a program like airgeddon, it will identify all your intefaces and their capabilities.

Ok, can someone please explain to me how tools that came pre-installed with kali and I assume are being updated and upgraded each time I do so, yet tools I've never opened before are littering my...

Which adapter? Are drivers current and/or supported?