I checked the timeline and saw that SetupParams runs at 9 min, but I did not find SetupParams within $WIN_NT$.~BT\winnt.sif. Should it be there? I'm not sure if this is relevant but after booting into Ubuntu after the failed install I can access the c drive without having to force mount it, indicating that the drive was shut down properly (unlike what happens with a crash). That must mean that setup is terminating on its own for some reason.