# python3 -> python

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 10

# pip3 -> pip

sudo apt-get update

sudo apt-get install -y python3-pip

sudo update-alternatives --install /usr/bin/pip pip /usr/bin/pip3 1

# port forwarding

sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 5000

이거 한줄 씩 입력하면

/bin/python python /usr/bin/python3 10

sudo: update-alternatives: command not found

터미널에 이렇게 뜨네요