I have no clue. When I've built custom kernels, I'm pretty sure that the new kernel wasn't active until I rebooted. But rebooting after even dist-upgrade has j

I have no clue. When I've built custom kernels, I'm pretty sure that the new kernel wasn't active until I rebooted. But rebooting after even dist-upgrade has just become automatic. For unattended upgrades, you can disable automatic reboot. But then, I think there's risk that some upgrades won't take effect.