How do I resolve, "An error occurred installing iOS 8.1.2?"

I am trying to install iOS 8.1.2.  The OS downloaded fine.  When I select Install, I receive the message, "Verifying update."  I then receive a pop-up with the message, "An error occurred installing iOS 8.1.2."  I am given the option to Close or Setting on the pop-up.  Both options simply close the pop-up.  I need further help to figure out how to install 8.1.2.
Thanks,
John

I would reset the phone and try once more
Restart or reset your iPhone, iPad, or iPod touch - Apple Support

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