I have been asked for a reply. I have not used the long-haired workaround, Klaus. Originally, i.e. late evening in Denmark (Feb3), the streamed TV program I was watching was having a bad time. So, I looked into the Update & Security panel in Settings.
It was busily checking for updates and eventually found KB4058258, which it started downloading in smaller portions. This took a long time. When the RESTART NOW button appeared, I stopped everything else and complied. After some more time, and more than one
restart, the computer got through all the tasks and I was back in business again after about 60-90 minutes altogether. I went back to the Update & Security panel to view Update History, but it was busily checking for updates again. Again, the RESTART NOW button
appeared, so I shut down the computer and went to bed. This morning, I pressed the button after start-up and everything had apparently gone well. Looking today at the Update History information, there are 2 entries for KB4058258. The older one, where it failed,
had error code 0x80240034, and the newer one was just normal 'successfully installed' info. That's it, folks! Regards, John