iPad Locked to Owner

If the iPad disabled or Activation Locked, unless you can independently obtain assistance from the previous owner, the iPad is (and will remain) useless to you. If you are able to contact the original owner, they will require this information:

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support

Here are the Apple support pages that outline the Activation Lock - and the only mechanisms by which it can be satisfied:

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Turn off Activation Lock – Apple Support

As you will discover, unless you are the owner of the AppleID that was last used to activate the device, you’ll not be able to defeat or bypass the Activation Lock. With documentary evidence that you are the original owner (such as the original sales receipt showing the serial number), Apple may be prepared to assist - otherwise they and nobody here will be able to help you.

There is no “fix”

Either that owner performs the steps outlined in the following article for you …

… or you have a paperweight.

How to remove Activation Lock - Apple Support

So, before you purchase your “next” pre-owned Apple device, suggest that you thoroughly familiarize yourself with this community member-submitted tip:

The All Too Common SAD Reality of Buying … - Apple Community

Rather than playing “Finders Keepers” …

… you might turn in in to the police; as it’s probably stolen and evidence of a crime.