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Fix GPG Error in apt update on Ubuntu 22.04 - Windows Defender Sync Not Working Across PCs-Microsoft Store Error 0x80073cf0 Fix Guide

Updated 2026-06-19 02:10:42windows-fixes
Fix GPG Error in apt update on Ubuntu 22.04 - Windows Defender Sync Not Working Across PCs-Microsoft Store Error 0x80073cf0 Fix 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.

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