How do I remove a secondary apple id from my Mac? I am being prompted for a apple id password for a former user; I do not have the information.  Prevents updates from App Store.

How do I remove a secondary Apple ID that is not in use from my MacBook pro? The ID does not belong to me and when I attempt to download updates from App Store with my Apple ID, I am prompted for the password of the secondary Apple ID.

Is this a second hand Mac? If so, you need to erase the Mac and install the version of OS X that shipped installed on the Mac from the factory. Then you set the Mac up as new with your Apple ID.
User Linc Davis explains how a new owner can prepare a 2nd hand Mac for their own use.
https://discussions.apple.com/message/25468326

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