Server 2016 to Server 2019 adprep error "Failed to verify file signature: error 0x800b0109."

Question

Hello,&nbsp;Running ADPrep in order to begin the process of upgrading 2016 to 2019 I get the following error:"Verifying file signatureFailed to verify file signature: error 0x800b0109.ERROR: Import from file D:\2019\support\adprep\sch88.ldf failed. Error file is saved in C:\Windows\debug\adprep\logs\20180501005227\ldif.err.88."&nbsp;I'm&nbsp;using server 2019 LTSB, the 2016 datacenter server is fully updated.Is there an .iso&nbsp;that has the sch88.ldf file with the correct signature?&nbsp;Any other ideas on how to resolve this issue?&nbsp;&nbsp;Thank you

greg kamer · Answer

I too ran into this issue. Looking forward to getting it licked! :)

dillon newell · Answer

This is a problem with the schupgrade.cat certificate not being trusted, see my reply here on how to fix

https://techcommunity.microsoft.com/t5/Windows-Server-Insiders/Problem-with-adprep-before-in-place-upgrade-of-domain-controller/m-p/196604/highlight/true#M445

dan sutton · Answer

You have to do adprep /domainprep as well: it works after that.

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Server 2016 to Server 2019 adprep error "Failed to verify file signature: error 0x800b0109."

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