Raspbian 11's Armv7l Rebels Pin Cffi <2.0 to Finally Install Certbot, Dodging Python's Dependency Minefield

On Raspbian 11, also known as Bullseye, running on armv7l architecture with Python 3.9, users have encountered issues installing Certbot via pip due to compatibility problems. To resolve this, a workaround involves pinning dependencies to avoid installation failures. Specifically, locking the cffi version to less than 2.0.0 allows for a successful Certbot installation. This can be achieved by running the command "pip install cffi<2.0.0 certbot" in a clean virtual environment. Alternatively, installing the libffi-dev system development package enables the installation of cffi version 2.0.0. Ensuring basic build tooling is present, such as build-essential and Python headers, and retrying with the --no-cache-dir option can also help resolve build-related issues. This version-pinning strategy provides a stable solution for installing Certbot on constrained ARM environments without requiring changes to the operating system or Python version, making it a significant development for users relying on Certbot for certificate management.