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I posted in the adjacent thread the solution that worked for mehttps://forums.developer.apple.com/message/370209#370209

After trying all the suggestions in this thread (and all the similiar threads for this problem I was able to google), and before giving up and doing clean installation of newer version, I made a deep dive in the essense of the issue - "coiuld not create Preboot volume..." and FOUND THE SOLUTION THAT PERFECTLY WORKED FOR MEI found that Preboot volume exists already on my drive (although is umnounted), so most probably running upgrade is just updating it.I tried to update Preboot manually viadiskutil apfs updatePreboot /Volumes/Macintosh\ HD/ordiskutil apfs updatePreboot /And this was unsuccesful due to (luckily this command is pretty well verbosed) absence of one of the AFPS crypto users in Mac users list ("An APFS crypto user was not found in the Open Directory user database"). This led to entire Preboot update was unsuccesful. I carefully checked whether this missing APFS does not exist anywhere in Directory Utility ('Users' in /Local/Default) by comparing GeneratedIUD code.So, this UUID missed everywhere, although diskutil apfs listcryptousers disk1s1 output was listing such crypto user. Most probably either myself or some program was manipulating users list, and has removed some of them in a non-consistent way, so it has gone from the users list, but was kept as cryptographic user on the filesystem level. And this inconsistency prevented Preboot from being upgraded.So I removed the cryptouser manually by:sudo fdesetup remove -uuid {UUID}Doublechecked via manual Preboot update to see it works well nowdiskutil apfs updatePreboot /Volumes/Macintosh\ HD/And proceeded with upgrade, which was without glitches now!Happy that I found a solution, but regretfully I wasted as much time, as I would spend on clean straightforward installation and all the backuping/restoring/programs intallations/etc.Hopefully I can save this time for one of you guys!