Not entirely correct. I've run into this problem on Catalina as well, and very often it IS a bug with the phone syncing (yes people still sync, we're not all ba

Not entirely correct. I've run into this problem on Catalina as well, and very often it IS a bug with the phone syncing (yes people still sync, we're not all backing up our phones to iCloud). The phone appears to be done syncing, there's no progress bar/circle/spinner anywhere, the phone might even be disconnected from USB (though some syncing can happen over wifi), and YET, and yet! The Mac refuses to let go and reboot. Unlike the blog author though, I figured out that 'sudo reboot' works very well in this situation...