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nice to know. Thanks

uninstall set and try
git clone https://github.com/trustedsec/social-engineer-toolkit/ set/

I guess its simply the different between ping an tracert. Not sure but u can test this with the ping option -N or -R?!
-R shows the route and -N shows the nodes. just try a bit around with the ping...

Do u have any knowledge about network protocols like ARP or services like DNS? I guess it would be really difficult for you to learn such things without any basic understanding how computers...

There is a Tool called "Xplico" ... an browser based sniffing tool and for your purposes it would be better than wireshark cause its sorts the sniffed Data in Categorys.
apt-get install Xplico ...

Hello,

first if you completley new to Linux you shouldn't use Kali or be really careful. Try another distro and learn as much as you can about Linux and how it works. Also learn all about how...

I wouldn't use apt-get purge metasploit (seems like a bad idea)
use apt-get remove metasploit-framework
this should be enough, than reinstall

Try apt-get install alsa-base alsa-utils

it works for me ;)

Have you set an USB-Filter in VirtualBox for the Wifi Card?