2025-10 Cumulative Update for Windows Server 2019 (KB5066586) Undoes Update on Reboot
We have a Windows Server 2019 Standard which will not install the 2025-10 Cumulative Update for Windows Server 2019 (KB5066586) update. The installation part goes fine, but when the server is rebooted to finalize the update, it goes into "Undoing changes". Then it reboots again, and I am back where I started. The error code is 0x8007000d. I have done the following to debug this: Ran System File Checker sfc /scannow. No errors found. DISM /Online /Cleanup-Image /ScanHealth. No errors found. Ran Windows Update Troubleshooter. No errors found. Shut down Windows Update services. Renamed SoftwareDistribution and Catroot2 folders. Restarted services. No change. Ran ScanDisk. No errors found. Disabled antivirus. No change. Ran Disk Cleanup and manually deleted additional temp files. No change. Checked Event Viewer. Only error is Event 20 which is a failure of the Windows Update Agent. I am out of ideas. If anyone has some, I would much appreciate the help. I am out of ideas.
