Same here today with Beta5. Mac mini late 2014 booted from an external microSD (worked fine with Catalina). “Progress bar stuck at 5%, not moving even after several hours”: same. Safe mode: I was unable to boot in it (login window, progress bar went up to 100% then stuck there). Erased the disk fully and started a clean install, which elapsed for around 5 hours, now it’s rebooted and showing progress bar stuck at 50%, not moving for nearly two hours now. I think I’m scrapping this until official release.
deliriouswombat
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