在Windows10运行的Ubuntu20.04环境中安装Airflow 2.1.4遭遇Errno 2文件不存在错误的解决咨询

Let’s work through this error step by step—your hunch about pip might not be the whole story, so let’s start with the most likely fixes first:

1. Fix the Syntax Error in Your Installation Command #

Looking at the command you shared, it’s missing a closing double quote at the end of the --constraint argument. This is a common shell parsing issue that can confuse pip into looking for an empty-named requirements file.

Your original command cuts off prematurely:

--constraint "${CONSTRAINT_URL}

Correct the full command (split into lines for readability):

AIRFLOW_VERSION=2.1.4
PYTHON_VERSION="$(python3 --version | cut -d " " -f 2 | cut -d "." -f 1-2)"
CONSTRAINT_URL="https://raw.githubusercontent.com/apache/airflow/constraints-${AIRFLOW_VERSION}/constraints-${PYTHON_VERSION}.txt"
pip3 install "apache-airflow[async,postgres,google,amazon,ssh,sftp]==${AIRFLOW_VERSION}" --constraint "${CONSTRAINT_URL}"

2. Verify the Constraint URL Is Valid #

Sometimes the auto-generated CONSTRAINT_URL might fail if your Python version parsing doesn’t work as expected. Let’s confirm:

• Run this command alone to check your parsed Python version:

  python3 --version | cut -d " " -f 2 | cut -d "." -f 1-2
  

  For Ubuntu 20.04, this should return 3.8 (the default Python 3 version).
• Check if the constraint file exists by running:

  curl -I "https://raw.githubusercontent.com/apache/airflow/constraints-2.1.4/constraints-3.8.txt"
  

  You should see a 200 OK response if the file is valid. Airflow 2.1.4 supports Python 3.6-3.9, so 3.8 is a valid match.

3. Upgrade pip to the Latest Version #

Older pip versions can have compatibility issues with modern package constraint files. Update pip with:

sudo pip3 install --upgrade pip

After upgrading, re-run your corrected installation command.

4. Use a Virtual Environment (Recommended) #

Using sudo with pip can mess up your system Python environment and cause permission conflicts. Instead, create an isolated virtual environment for Airflow:

# Create a virtual environment
python3 -m venv airflow-env
# Activate the environment
source airflow-env/bin/activate
# Run your corrected Airflow installation command inside this environment

This keeps your system packages clean and avoids unexpected errors.

5. Manually Download the Constraint File (If Network Issues Occur) #

If you’re blocked from fetching the remote constraint file due to network restrictions, download it locally first:

wget https://raw.githubusercontent.com/apache/airflow/constraints-2.1.4/constraints-3.8.txt

Then install Airflow using the local file:

pip3 install "apache-airflow[async,postgres,google,amazon,ssh,sftp]==2.1.4" --constraint ./constraints-3.8.txt

内容的提问来源于stack exchange，提问作者Hedieh Moradi