How to resolve the error code 0x800f0926: Windows couldn't install updates in Windows Server 2012 R2

There are a few steps you can follow to address the error code 0x800f0926:

1. Verify your internet connection: Ensure your internet connection is stable and sufficient to download and install updates.
2. Run the Windows Update troubleshooter: Navigate to Control Panel > Troubleshooting > System and Security > Fix problems with Windows Update. Follow the instructions to run the troubleshooter and see if it can detect and resolve the issue.
3. Temporarily disable antivirus software: At times, antivirus software can hinder the installation of updates. Try disabling your antivirus software temporarily to see if that fixes the problem.
4. Check for corrupt system files: Open Command Prompt as an administrator and execute the command 'sfc /scannow' to scan for and repair any corrupt system files.
5. Manually download and install the update: If all else fails, you can try manually downloading and installing the update from the Microsoft Update Catalog website. Ensure you download the correct update for your version of Windows Server 2012 R2.