How to Fix Ubuntu APT Lock Error by Removing /var/lib/apt/lists/lock - Resolve Windows Security Hangs During Startup-Windows Search Post-Update Troubleshooting Guide
Before changing system settings, save your work and note the exact error text so you can compare results after each step.
Extra verification checklist
- Restart the affected app after changing permissions or configuration files.
- Test the same workflow in a clean browser profile or a temporary user account.
- Compare the result on another network if the error may be connection related.