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Upon attempting to install the Windows Server 2019 Cumulative Update, the process failed to complete after reaching 100%. Troubleshooting was conducted through both the GUI and PowerShell; however, the installation of KB5005030, KB5005102, KB5005112, KB5009557, and KB5005030 has been unsuccessful, resulting in update failed error 0x800F0985.
The detailed error message is as below:
There were problems installing some updates, but we’ll try again later.
Cumulative Update for Windows Server 2019 for x64-based Systems – Error 0x800f0985
From the Windows Event Viewer, it generates an Error entry Event ID 20 as shown below:
To resolve the Windows Server 2019 Cumulative Update failed with Error 0x800f0985, please follow the steps outlined below.
Solution 1: Reset Windows Update components manually
Step 1: Refer to this Microsoft Docs to reset Windows Update components manually.
Step 2: Install the latest SSU KB5000859: Servicing stack update for Windows 10, version 1809: March 9, 2021.
Step 3: Restart Windows Server 2019.
Step 4: Manually download and install the latest CU KB5001568 from Microsoft update catalog, this update fixes the known issue which might cause a blue screen when you attempt to print to certain printers using some apps.
Solution 2: Repair Windows Update using SFCFix tool
Step 1: Download the latest version of SFCFix and save it to your Desktop.
Step 2: Open SFCFix and click Yes on the UAC (User Account Control) prompt which appears.
Step 3: SFCFix will now open and guide you through the rest of the process. SFCFix will complete and report on whether it found any corruptions.
Step 4: SFCFix will open a log file called
SFCFix.txt giving technical details on any problems which were found.
Step 5: Open Start, search for Command Prompt, right-click it and select the Run as administrator option.
Step 6: Type the following command and press Enter:
DISM /Online /Cleanup-Image /RestoreHealth
Step 7: Run below commands on the command prompt to restart windows update services:
net stop bits
net stop cryptsvc
net stop wuauserv
net stop msiserver
Ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
Ren C:\Windows\System32\catroot2 Catroot2.old
net start bits
net start cryptsvc
net start wuauserv
net start msiserver
Step 8: Restart your PC.
Solution 3: Escalate to Microsoft Support
Open a request ticket with Microsoft support.
Microsoft Docs > Q&A > Server 2019 Cumulative Updates failing every month