On Sat, 20 Mar 2021 15:22:25 -0000 (UTC), Martin Gregorie
 declaimed the following:

>
>That makes sense. Thanks.

 If it makes anything better -- I tried to boot my experimental R-Pi 3b+
yesterday. Took three tries before it showed up on my router. Ran the apt
update/upgrade sequence, and upgrade failed with the same error you have.

 I copied off the top level my home directory, removed the SD card, and
formatted it with SD Card Formatter. Now preparing to install new OS.

 It appears that the R-Pi organization has dropped the NOOBS installer,
and only provides downloads for each specific OS.


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