Install instructions don't work on Ubuntu 24.04

[abentley]

The install instructions say to run pip install pipenv, but only pip3 may be installed.

Using pip3 produces this error:

$ pip3 install pipenv
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.

After using python3 -m venv to install pipenv, I am unable to run pipenv --python 3.11:

$ pipenv --python 3.11
Warning: Python 3.11 was not found on your system...
Neither 'pyenv' nor 'asdf' could be found to install Python.

I don't know what either package is. Neither seems to be installable via pip. https://github.com/pyenv/pyenv#installation wants me to run a bash script directly off the web which is a nonstarter.

[frrad]

You're going about things in a reasonable way here, but you do need to get python 3.11 somehow. If you're unwilling to use pyenv to get it you may be able to install it from source manually.

Another thing you might try is to upgrade the project to use python 3.12. There's a chance it will just work, but no guarantees.

[abentley]

I ended up building the docker image instead.
In my 20 or so years of writing Python, I can't think of a time that a newer minor version of Python has broken my code.

But anyhow, the point of this issue is that the instructions as given really don't work on Ubuntu 24.04.