The following install step failed: run preupgrade script for AppleMobileDeviceSupport. Contact the software manufacturer for assistance.

Just upgraded software. When system prompts to update itunes and in the middle of the system's attempt to complete the upgrade, the message, "The following install step failed: run preupgrade script for AppleMobileDeviceSupport. Contact the software manufacturer for assistance" appears.
I don't understand what "preupgrade" needs to be done.
Anyone else experience this?
Suggestions?

-= Pre Upgrade Script Error with iTunes =-
Do a general web search and you will discover there are many answers, none definitive.
iTunes: How to remove and reinstall the Apple Mobile Device Service on Mac OS X 10.6.8 or Earlier - http://support.apple.com/kb/ht1747
scarier:
https://discussions.apple.com/message/10464515#10464515

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