📖 ~1 min read
Table of contents
Symptom & Impact
Python apps fail to start with missing interpreter or module import errors.
Environment & Reproduction
Debian 13 hosts after system python minor updates and stale virtualenv links.
Root Cause Analysis
Virtualenv points to removed interpreter paths and incompatible compiled wheels.
Quick Triage
Inspect virtualenv python binary target and pip environment health.
Step-by-Step Diagnosis
Identify broken shebangs and validate dependency compatibility with new interpreter.
Solution – Primary Fix
Recreate virtualenv using current interpreter and reinstall locked dependencies.
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Solution – Alternative Approaches
Use pyenv or containerized runtimes to isolate application python versions.
Verification & Acceptance Criteria
Application starts successfully and smoke tests pass under rebuilt environment.
Rollback Plan
Restore previous environment archive if rebuilt dependency set causes regressions.
Prevention & Hardening
Pin Python versions and maintain reproducible lockfiles for dependency installs.
Related Errors & Cross-Refs
Related symptoms include bad interpreter and ModuleNotFoundError after upgrade.
Related tutorial: View the step-by-step tutorial for Debian 13.
View all Debian 13 tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Python venv documentation and Debian Python policy guidance.
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