Error code

Windows 0x80240020

WINDOWS0x80240020
System Error Code· A POSIX/system errno returned when a system call fails.

What it means

WU_E_NO_INTERACTIVE_USER: the operation did not finish because no interactive user is signed in..

Per dataset:Windows

WU_E_NO_INTERACTIVE_USER - Operation did not complete because there is no logged-on interactive user..

Per dataset:Windows

How to fix it

  1. Sign in to the device.
  2. retry the update from Settings.
  3. allow the device to restart to complete installation.

Not affiliated with Windows. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.