CU update on AVD keeps hanging at 9% and fails to install

The issue you're experiencing with the cumulative update hanging at 9% and failing to install on your Azure Virtual Desktops (AVDs) could be related to several factors. Here are some steps you can take to troubleshoot and potentially resolve the problem:

1. Check Windows Update Status: Ensure that your Windows operating system is fully updated before attempting to install the cumulative update. Sometimes, pending updates can cause issues with new installations.
2. Antivirus Software: Temporarily disable any antivirus software you have running, as it may interfere with the update process.
3. Windows Recovery Environment (WinRE): If you suspect that the AppX packages might be corrupt, accessing WinRE can help. From WinRE, you can perform a system restore or use the command prompt to repair Windows components.
4. Increase Timeout for Installation: If the Trusted Installer service is timing out, you might consider increasing the timeout value in the registry. This can sometimes help with installations that take longer than expected.
5. Check Logs: Review the CBS.log file located in %SystemRoot%\Logs\CBS for any specific error messages that could provide more insight into what is causing the installation to fail.
6. Contact Microsoft Support: If the issue persists, reaching out to Microsoft Support may provide additional assistance tailored to your specific situation.

These steps should help you diagnose and potentially resolve the update issue on your AVDs.

Hey @Joseph Strong !

I see you're having issues with AVD updates getting stuck at 9%. That can be really frustrating! Here's what you can do to troubleshoot and hopefully resolve the issue:

Suggested Steps:

1. Check Windows Update Logs: Review the Windows Update logs to identify any specific errors occurring during the update process. This can often give clues about what's causing the hang.
2. Run Windows Recovery Environment (WinRE): Since you mentioned that AppX might be corrupt, it could be beneficial to boot into WinRE. From there, you can run the repair tools available, such as:
   • Startup Repair: This can sometimes fix problems that prevent Windows from starting correctly.
   • System Restore: If you have a restore point before the problematic updates were installed, reverting to that point might resolve the issue.
3. Uninstalling Updates: If the updates continue to fail, you might want to consider uninstalling the problematic updates from WinRE. Look for the "Uninstall Updates" option and see if you can revert the recent cumulative update.
4. Reinstall the Remote Desktop Client: If the issue appears to be with the Remote Desktop client, you may want to uninstall and reinstall it. Use the MSI installer for a complete installation.
5. Check for Antivirus Conflicts: Sometimes, antivirus software can interfere with updates. Ensure your antivirus is not blocking the update process.
6. Reset Windows Components: In cases where the updates consistently fail, you can reset Windows Update components. This can often clear up any underlying issues that may be causing failures.
7. Review Network Configuration: Ensure that there are no networking issues causing the updates to hang, like DNS problems or network access restrictions.

Reference Documentation:

• Troubleshooting Installing and Updating the Client
• I'm Unable to Download or Install Updates
• Troubleshoot Session Hosts Stuck in Unavailable or Upgrading

Follow-Up Questions :

• Have you checked the Windows Update logs for specific error codes?
• Are there any other error messages appearing apart from the ones you mentioned?
• What antivirus solution are you using, if any?
• Have you tried any other troubleshooting steps so far?

I hope this helps get you back on track! Let me know if you have any other questions!