My rPi3B+ will no longer shutdown or reboot since the update a couple days ago. Power it off and on after it hangs and it restarts and runs fine.
I have restored from backups and started from scratch several times with the same results. I also have used two different SD cards and my SSD with the same results.
Through experimentation, it seems to be caused by removing Wolfram. I usually remove Wolfram and other stuff first thing before doing my initial update and installing the programs I want. I just did a full normal setup run from scratch without the entry to remove Wolfram and all was fine. I then removed Wolfram and I cannot reboot or shutdown again.
Let me know if I need to provide any documentation and how to do so.
Edit: I didn't say, but when I restore from my backups ( a couple weeks old if that), all is fine until I update.