📖 ~1 min read
Table of contents
Symptom & Impact
Python tools break after pip installs into system paths, affecting apt-managed dependencies.
Environment & Reproduction
Ubuntu 18.04 with Python 3 where sudo pip was used on global interpreter.
Root Cause Analysis
Mixing apt and pip in /usr/lib/python3/dist-packages introduces version conflicts and file ownership overlap.
Quick Triage
Run python3 -m pip –version, dpkg -S on conflicting files, and check virtualenv usage.
Step-by-Step Diagnosis
List modified system packages and identify pip-installed modules shadowing apt packages in sys.path.
Solution – Primary Fix
Reinstall affected apt python packages, remove conflicting pip global installs, and move workloads to venv-based installs.
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Solution – Alternative Approaches
Use pipx for isolated CLI tools or pyenv for user-space interpreter separation.
Verification & Acceptance Criteria
System tools run cleanly and project dependencies install inside virtual environments without apt breakage.
Rollback Plan
Restore full package state from image snapshot if manual cleanup cannot fully reconcile ownership.
Prevention & Hardening
Ban sudo pip in operational policy and standardize virtualenv or container-based Python workflows.
Related Errors & Cross-Refs
ModuleNotFoundError for distro-managed tools, apt postinst python failures, and import version mismatch.
Related tutorial: View the step-by-step tutorial for Ubuntu 18.04 LTS.
View all Ubuntu 18.04 LTS tutorials on the Tutorials Hub →
Browse all common problems & solutions on the Tutorials Hub.
References & Further Reading
Python packaging guide, venv docs, and Ubuntu Python policy notes.
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