Without intending to circlejerk, the only linux updates that I have encountered that required a reboot were kernel updates, and they don't force a reboot, they just don't apply until you do. And when you do update the kernel, the update is downloaded and set up without interrupting anything. You can just power off when you're done, and next time you power on, it's already updated. None of those "Please wait 5-10 minutes, and don't power off your PC" messages.