This is important for #whonix_15 for non-live (!) as well as #live-mode.
#Qubes specific considerations:
>> Templates are always booted first before the user has a chance to start a templatebased VM?
> Yes, part of the template installation process is starting it and launching `qubes.PostInstall` service.
> Although there is no retry mechanism, if the first attempt fails (for example not enough memory).