KB5006672 - Error 0x800f0986

Michael Middlekauff 6 Reputation points

I have been trying to install 2021-10 Cumulative Update for Windows Server 2019 (1809) for x64-based Systems (KB5006672) since buying Server and cannot get the update to install. I have tried a number of suggestions that are out on the web and nothing seems to help.


Windows Server 2019
Windows Server 2019
A Microsoft server operating system that supports enterprise-level management, data storage, applications, and communications.
2,204 questions
Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
8,229 questions
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  1. Limitless Technology 37,351 Reputation points

    Hi there,

    The update error 0x800F0986 may occur if the essential system files are corrupt. Moreover, corrupt Windows update components may also cause the issue at hand

    You can try getting the update manually and try installing them .

    The updates may fail to install if the first partition of your system is not marked as active because the OS has to put some essential files on the first partition

    Right-click on the Start menu/Windows button and in the Quick Access menu, choose Disk Management.
    Now right-click on the first drive and choose Mark Partition as Active
    Then reboot your PC and check if the updates are installing normally.

    Then try running SFC & DISM commands and try updating again.

    --If the reply is helpful, please Upvote and Accept it as an answer--

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  2. Michael Middlekauff 6 Reputation points

    I tried all of that and it did not fix the problem. I still cannot get the KB to install. It get to where it says it installed 100% but then says it failed.

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