I've got an error while upgrading Windows Server 2016 Technical Preview 4 (TP4) to Tech Preview 5 (TP5):
Advanced error description can be found in the file:
C:\$WINDOWS.~BT\Sources\Panther\setuperr.log
In my case the file setuperr.log has the following content:
Advanced error description can be found in the file:
C:\$WINDOWS.~BT\Sources\Panther\setuperr.log
In my case the file setuperr.log has the following content:
...Error IBSLIB OSRollbackService::CBootFilesRestoreCheckpoint::Finalize: Failed to backup BCD database from "G:\Boot\BCD" to "C:\$WINDOWS.~BT\Sources\Rollback\Boot\BCD".[gle=0x00000006] Error [0x064199] IBSLIB SetCheckpoint(WinPEBootFilesRestoreCheckpoint): threw exception.: class RollbackException: RollbackException: Error(6), CSystemVolumeSelectionCheckpoint: Failed to backup BCD database. void __cdecl OSRollbackService::CBootFilesRestoreCheckpoint::Finalize(const unsigned short *,struct OSRollbackService::ICheckpointParameters *)[gle=0x00000006]