Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

View list

Fix Jupyter Notebook Token Expired or Invalid Error

When you try to open Jupyter Notebook and see “token expired” or “invalid token,” it usually mean...

Fix 'Access Denied' for Chrome Extensions

You try to install or enable a Chrome extension and see an 'Access denied' message. This can happ...

How to Clear Windows Update Cache for Pending Installs

You see 'Pending install' in Windows Update but the download or install never finishes. Sometimes...

How to Remove the Ubuntu dpkg Lock File

When you see an error like 'E: Could not get lock /var/lib/dpkg/lock' or 'E: Unable to lock the a...

How to Fix Remote Desktop 'Connection Refused' or 'Permission Denied'

You open Remote Desktop, enter the computer name, and get either "Connection refused"

Fix PowerShell Authentication Failed to Remote Server
When you see 'Authentication failed' in PowerShell while trying to connect to a remote server, it...