There is a shutdown option when you are on lock screen but it only shows up when you are logged off. Second tip comes from WithinWindows, who points to a very obvious option which most of use might never see.
To make sure you have hibernation enabled, look into your power settings. I do it most of the time and reboot my computer and shutdown it properly only when I reach home. First its is one click solution your computer shuts down, all your current state is saved and updates are skipped. This is the simplest and most easiest option you can choose for and it has its own advantages. Below are some methods you would love to use : So now the question is how you going to skip the update and still shutdown your computer.
Though its a good thing to do that but then if you are in a hurry you cannot wait for the update to complete for next 20 minutes and its even more annoying when you have a weak battery so you cannot jusy unplug and put it in your bag pack to let it to. Many a times it happens that when you go to shutdown your computer at the end of the day, it asks you to install updates without giving any option to skip it.