Failed to upgrade SharePoint Products using GUI. How to fix this ?
This is a critical task. You have to fix the failures before you can continue. Follow this link for more information about how to troubleshoot upgrade failures: https://go.microsoft.com/fwlink/?LinkId=866803
An exception of type Microsoft.SharePoint.PostSetupConfiguration.PostSetupConfigurationTaskException was thrown. Additional exception information:
Feature (Name = [Form_webservice], Id = [1bb9d6bf-3d6c-a83b-685f-43708c2d885c], Description = [Microsoft InfoPath Form template.], Install Location = [FT-01-1bb9d6bf-3d6c-a83b-685f-43708c2d885c]) is referenced in database [WSS_Content_Intranet], but isn't installed on the current farm. The missing feature might cause upgrade to fail. If necessary, please install any solution that contains the feature and restart upgrade. (EventID:ajxkh)
Only solution is running the below powershell.
psconfig.exe -cmd helpcollections -installall -cmd secureresources -cmd services -install -cmd installfeatures -cmd applicationcontent -install -cmd upgrade -inplace b2b -force -wait