I am trying to write a python script on an Ubuntu box. I had it working fine on another box, but now cannot get it to install some libraries. Keep getting the "externally-managed-environment" error.

However, I am using a venv.

Python 3 is installed.

I've run:

apt install python3-pip -y

and

apt install python3-venv

Create the venv:

python3 -m venv sensu-venv

Activate it

source sensu-venv/bin/activate

So now my prompt looks like

(sensu-venv) ubuntu@ip-xxx-xxx-xxx-xxx:~/listener

Output of which python3 is "/home/ubuntu/listener/sensu-venv/bin/python3"

I have then run every combination of pip install but get the same result:

python -m pip install pika --upgrade
python3 -m pip install pika --upgrade
pip install pika --upgrade
pip3 install pika --upgrade

But always get the externally managed error.

Have tried deactivate/delete the venv subdirectory, recreate.

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.