Yet another issue with the most recent version of Windows 10 has been revealed. If you are upgrading the OS from version 1803 to Windows 10 version 1809, this may break the built-in Administrator user account.
This issue is reproducible when the user is upgrading the OS from Windows 10 version 1803 to version 1809 under the following conditions.
- The built-in Administrator account is valid.
- There are other accounts that also have Administrator permissions.
Both of the above conditions should be satisfied.
Microsoft are currently working on solving this problem, and they are going to release a patch in late January 2019.
If you need to upgrade before the patch is released, ensure that you can defintely sign in with a user with administrative privileges other than the built-in administrator, before you upgrade.
Also, if you have already upgraded and you have invalidated the built-in Administrator, you are signed in as a user with administrator privileges other than the built-in Administrator, activate the built-in Administrator.
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