Catalina upgrade spinner graphics don't clear

After a while during Catalina upgrade the activity spinner does not clear graphics as it spins till the pattern of bars is a full circle. Upgrade does not progress. Machine is a 2017 iMac.

I had the same issue. Only way to get past is to boot in safe mode.


MB 12"

Exactly the same. Can boot into Safe mode all day long. Can perform normal Boot.

Catalina upgrade spinner graphics don't clear
 
 
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