This script will setup Python virtualenv, I made it specifically for setting up Cuckoo. Please see the notes in the script before running.

cuckoo-setup-virtualenv.sh

#!/usr/bin/env bash

# Author: Josh Stroschein
# Source: https://askubuntu.com/questions/244641/how-to-set-up-and-use-a-virtual-python-environment-in-ubuntu
# NOTES: Run this script as: sudo -u <USERNAME> cuckoo-setup-virtualenv.sh
#        Additionally, your environment may not allow the script to source bashrc and you may need to do this manually after the script completes

# install virtualenv
sudo apt-get update && sudo apt-get -y install virtualenv

# install virtualenvwrapper
sudo apt-get -y install virtualenvwrapper

echo "source /usr/share/virtualenvwrapper/virtualenvwrapper.sh" >> ~/.bashrc

# install pip for python3
sudo apt-get -y install python3-pip

# turn on bash auto-complete for pip
pip3 completion --bash >> ~/.bashrc

# avoid installing with root
pip3 install --user virtualenvwrapper

echo "export VIRTUALENVWRAPPER_PYTHON=/usr/bin/python3" >> ~/.bashrc

echo "source ~/.local/bin/virtualenvwrapper.sh" >> ~/.bashrc

export WORKON_HOME=~/.virtualenvs

echo "export WORKON_HOME=~/.virtualenvs" >> ~/.bashrc

echo "export PIP_VIRTUALENV_BASE=~/.virtualenvs" >> ~/.bashrc 

source ~/.bashrc

Everything was going fine in all steps of your tutorial, until i faced this. How to go through this.

I can't say for sure but looks like there may be two issues - first, you have a typo in the last octet of your IP address, ".1011". I'd try removing that. The second is that there is an error stating that the Vm already exists so I would try either removing it and starting over or using different information to set it up.