Disk is Locked error when trying to upgrade to macOS Sierra


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Problem:  Trying to upgrade to  macOS Sierra on my MacBook pro (15-inch, Mid 2012) and I keep getting an error saying that my disk is locked.  So I’m not able to select the hard disk to install the OS.  Tried rebooting it just brought be me back to the macOS Utilities menu.  Tried reinstalling the […]
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