/usr/bin/python: No module named pip , after installing pip

Question

I try to install this gimp 2.10 plugin.

https://github.com/manu12121999/RemoveBG-GIMP

according the instructions i used this command

chmod +x remove_background.py
python -m venv gimpenv
source gimpenv/Scripts/activate
python -m pip install requests
deactivate


/usr/bin/python: No module named venv
bash: gimpenv/Scripts/activate: No such file or directory


/usr/bin/python: No module named pip
deactivate: command not found

user@Main:~$ pip3 --version
pip 20.3.4 from /usr/lib/python3/dist-packages/pip (python 3.9)