How to install theHarvester on Ubuntu 18.04 LTS

theHarvester.sh

# Youtube: https://www.youtube.com/channel/UC8dSAxutoOJuoy7kExTd0AQ

# !/bin/sh

# use to git clon to download and clone the theHarvester from Github
git clone https://github.com/laramies/theHarvester 

# Now enter into the theHarvester Folder 
cd theHarvester

# Now install pip 
sudo apt install python3-pip

# Now run the command if not donot work then run second one
python3.7 -m pip install -r requirements/dev.txt

# Else:
python3.7 -m pip install -r requirements/base.txt

# NOw run theHarvester
python3.7 theHarvester.py -h 

# For Generating email list use this command
python3.7   theHarvester.py   -d   gmail.com   -l   500   -b   google

I tried following the above steps, but received this message:

error: externally-managed-environment

× This environment is externally managed
╰─> To install Python packages system-wide, try apt install
    python3-xyz, where xyz is the package you are trying to
    install.
    
    If you wish to install a non-Debian-packaged Python package,
    create a virtual environment using python3 -m venv path/to/venv.
    Then use path/to/venv/bin/python and path/to/venv/bin/pip. Make
    sure you have python3-full installed.
    
    If you wish to install a non-Debian packaged Python application,
    it may be easiest to use pipx install xyz, which will manage a
    virtual environment for you. Make sure you have pipx installed.
    
    See /usr/share/doc/python3.12/README.venv for more information.

note: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages.
hint: See PEP 668 for the detailed specification.

I am getting an error
python3 theHarvester.py -h
Traceback (most recent call last):
File "/home/akkugadre/theHarvester/theHarvester.py", line 5, in
from theHarvester.theHarvester import main
File "/home/akkugadre/theHarvester/theHarvester/theHarvester.py", line 4, in
from theHarvester import main
File "/home/akkugadre/theHarvester/theHarvester/main.py", line 13, in
import ujson
ModuleNotFoundError: No module named 'ujson'

but ujson is installed I am not sure what I am doing wrong can some one please help?

I was able to get around it by using
python3 -m pip config set global.break-system-packages true
which I should probably not do since it promises to break system packages, but wth, i am on a personal system, little infractions are ok among friends right?!