Checklists for software errors, setup, and tool workflows.

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Latest checklists

When creating a Python virtual environment on newer Linux distributions (e.g., Debian 12, Ubuntu ...

If you see connect() failed (111: Connection refused) or connect() failed (13:...

Fixing Docker Pull Access Denied in Docker Desktop
You try to pull a Docker image in Docker Desktop and see access denied. This usually...

Fix ERR_CERT_AUTHORITY_INVALID in Chrome Incognito Mode
You open Chrome incognito and hit a warning: NET::ERR_CERT_AUTHORITY_INVALID. Th...

Pip Externally Managed Environment Error: Causes and Fixes
When you run pip install and get the error error: externally-managed-environme...

Windows Security App Not Opening: Practical Fixes
If the Windows Security app won't open—clicking the icon does nothing, or it crashes immediat...