OpenCV libGL/libgthread dependency errors on Streamlit Community Cloud

Welcome to the Streamlit community and thank you for your detailed feedback! You’re absolutely right—deploying apps with native dependencies like OpenCV on Streamlit Community Cloud can be tricky, especially when system-level libraries are missing or when the underlying Debian repositories have issues. The errors you encountered (expired APT repo, missing libGL.so.1, and libgthread-2.0.so.0) are common pain points for users deploying computer vision apps, and troubleshooting them often requires adding the right packages (like libgl1 and sometimes libglib2.0-0) to packages.txt, as you discovere