Fix WebAuthn Installation cryptography.openssl.x509 Error on Ubuntu 20.04

Problem

When installing or using webauthn with Odoo, you may encounter the following error:

ModuleNotFoundError: No module named 'cryptography.hazmat.backends.openssl.x509'

This is typically due to incompatible versions of cryptography, urllib3, or pyOpenSSL.

Check Installed Versions

Run the following command to check the installed versions:

pip list | grep -E 'cryptography|urllib3|pyOpenSSL'

Example output:

cryptography      45.0.2
pyOpenSSL         25.1.0
urllib3           1.26.5

Note: urllib3 is outdated in this example.

Fix Instructions

Step 1: log into container

docker  exec -it -u root  <odoo_container> /bin/bash

Step 2: Upgrade urllib3

pip install --upgrade urllib3

Verify the upgrade:

pip show urllib3

You should see:

Name: urllib3
Version: 2.4.0

Step 4: Recheck versions

pip list | grep -E 'cryptography|urllib3|pyOpenSSL'

Expected output:

cryptography      45.0.2
pyOpenSSL         25.1.0
urllib3           2.4.0

Restart your Odoo server and the error should be resolved.

Summary

Make sure all dependencies are compatible and up-to-date.