I recently had a Windows 2016 server that could not install automatic updates. It always hang at some percentage and would never finish. The next step was to try to install an update (.msu file) manually. But this always hung forever at 'Copying packages to the update cache'.
If your updates are stuck in the background while you still have access to Windows, you can restart as normal; if they're stuck before or after the OS loads, you're going to have to hold down the. Internet Explorer 11 Update Hangs - posted in Windows 7: Hi, Ive been having problems with this computer and initially posted about problems with it in the Maleware forum (www.bleepingcomputer.com. When Windows Update is stuck, it either won’t install or takes an unusually long time to install. If Windows Update gets stuck, your first instinct is to power your computer off and try again. But Windows explicitly warns against turning off your PC when an update is installing.
Here is what helped me:
Start a cmd box as Administrator
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Run the following commands:
This will clear the Windows Update cache and the automatic updates should work again.
Update: Some readers have commented that if the Windows Update Service (wuauserv) does not stop, kill it in Task Manager:
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Look in the Services tab of Task Manager, find the PID (process ID) for Windows Update Service, then do: taskkill /f /p 1234 from an admin command prompt, where 1234 is the PID you found.