Installation script fails

[luisacabs-out]

• NA: I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• Running in a python:3.6 container:
• Poetry version:
• Link of a Gist with the contents of your pyproject.toml file:

Issue

Since the new changes in the installation script install-poetry.py, I am not able to install poetry as recommended.

I was trying to build an image with poetry in my CI pipeline and it just broke because of this issue.

I tried to run:

curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/install-poetry.py | python -

An got the following output:

Retrieving Poetry metadata

# Welcome to Poetry!

This will download and install the latest version of Poetry,
a dependency and package manager for Python.

It will add the `poetry` command to Poetry's bin directory, located at:

/root/.local/bin

You can uninstall at any time by executing this script with the --uninstall option,
and these changes will be reverted.

Installing Poetry (1.1.8): Installing Poetry
Traceback (most recent call last):
  File "<stdin>", line 832, in <module>
  File "<stdin>", line 828, in main
  File "<stdin>", line 440, in run
  File "<stdin>", line 464, in install
  File "<stdin>", line 588, in install_poetry
  File "/usr/local/lib/python3.6/subprocess.py", line 423, in run
    with Popen(*popenargs, **kwargs) as process:
TypeError: __init__() got an unexpected keyword argument 'capture_output'

pip install seems to work fine.

[luisacabs-out]

Replicate of issue #4441

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