Error: We couldn’t complete the updates, Undoing changes. Don’t turn off your computer.

I cannot update at all I get error code 802

I'm not getting an error code at all. This is a well known issue at this point. Hopefully Microsoft will do the right thing and eventually release an easy fix for this.

I cannot update at all I get error code 8024000B

The only solution now is a refresh/rebuild.  There's no other automated fix.  The servicing stack is screwed up and can't get this update installed.

I'm sorry that I don't have any better solution.

After all this time this is unacceptable. Microsoft made the mistake they need to own up to it and fix this.

This error may appear anytime a Windows Update fails. To investigate possible solutions, we need to start with the specific error code.

We can do this by viewing your update history.

1. Swipe in from the right edge of the screen (or, if you're using a mouse, pointing to the lower-right corner of the screen and moving the mouse pointer up), and tap or click Settings.
2. Tap or click Change PC settings, and then Update and recovery.
3. Tap or click View your update history.

View failed update error code.

Please post here with your error code, so that the Community can try to help guide you appropriately.

KB2971239.......have been getting this for OVER a month

            The pause/play key is on the f9 key of my computer.

Sorry for the confusion of my brevity.   The steps (keystroke sequence) would be:

1. Press and hold Win.   (You are going to be attaching the next keystroke to it, so Win- is my way of noting that you are to use this step as a modifier.)
2. Press and release X
3. Release Win- but, depending on your Personalization settings, before releasing you may have to notice that the Control P**anel item has its P underlined.  That is called an accelerator which we can type to cause that item to be selected and actioned.
4. Type P.
5. Wait for a Control Panel window to open.  This is what I was trying to indicate by putting the word pause in parentheses.  In retrospect I probably should not have capitalized it.
6. Keyboard focus in the Control Panel window is conveniently in its Search bar.  (Who knew?)
7. Type V
8. See some stuff that matches V
9. Press Spacebar.  (Sorry. I overlooked this step.)
10. Type U
11. See more stuff that matches both V and U.  Happily the first items are Windows Update followed by View update history
12. Press Tab to navigate to Windows Update
13. See dotted lines surround Windows Update for confirmation that the previous step worked as intended
14. Press Tab to navigate to View update history
15. See dotted lines surround View update history for confirmation that the previous step worked as intended
16. Press Spacebar to action the selected item
17. See the window change to  View update history

You should now have a view of your update history which does not depend on MUF (Modern UI Fullscreen) working.   QED.