On the beaglebone run:

$ sudo ifconfig usb0 192.168.7.2
$ sudo route add default gw 192.168.7.1

On debian run

# iptables --table nat --append POSTROUTING --out-interface wlp9s0 -j MASQUERADE
# iptables --append FORWARD --in-interface enx6064052221ca -j ACCEPT
# echo 1 > /proc/sys/net/ipv4/ip_forward
# ufw disable
# ufw enable

And then on beagle run:

# echo "nameserver 8.8.8.8" >> /etc/resolv.conf