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Copper Contributor

May 01, 2018

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

Hello, Running ADPrep in order to begin the process of upgrading 2016 to 2019 I get the following error: "Verifying file signature Failed to verify file signature: error 0x800b0109. ERROR: Imp...

Copper Contributor

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

Copper Contributor

Oct 03, 2018

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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