Updates may not be installed with Fast Startup in Windows 10
This article discusses an issue where Windows updates might not be installed with the Fast Startup feature in Windows 10 after you shut down your computer.
Applies to: Windows 10 - all editions
Original KB number: 4011287
Windows updates might not be installed on your system after you shut down your computer. This behavior occurs when the Fast Startup feature is enabled. This behavior doesn't occur when you restart your computer.
The Fast Startup feature in Windows 10 allows your computer start up faster after a shutdown. When you shut down your computer, Fast Startup will put your computer into a hibernation state instead of a full shutdown. Fast Startup is enabled by default if your computer is capable of hibernation.
Installation of some Windows updates can be completed only when starting your computer after a full shutdown. Since Fast Startup uses hibernation instead of a full shutdown, installation of those updates will not be completed before a full shutdown. In order to make sure pending updates are completed, you have to choose Restart from the Power menu.
In environments managed with Microsoft Endpoint Manager Configuration Manager (MEMCM), Fast Startup may delay the completion of updates as well. This has been addressed in MEMCM 2002 and Windows 10 21H1.