Upgrading from 5.7.5.13 to 8.x

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We are currently attempting to update Concrete 5 and our version of PHP that Concrete 5 is running on. We're updating to the following:

1. Concrete 5 from 5.7.5.13 to 8.x
2. PHP 5.6 to PHP 7.x
We have gone through all of the installation methods, and we run into a database error when we update Concrete 5 no matter what method we try. In each instance, we are getting a very similar error message shown below. The one thing all of these error messages have in common is that they reference a database table name that starts with an underscore "_". While the table name can change, the "_" is always present. Searching through the database, it appears that these tables do exist, but none of them are prefixed with the underscore present in the error message below. It seems that for some reason the update process is referencing these database names incorrectly and looking for a table name with an underscore.

Any ideas would be much appreciated.

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