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Uncaught Reference Error when searching Batch Payments

Situation
When searching for a Batch Payment, after typing a character into the “Payment From:” field, I recieve a pop-up error dialog stating:

Uncaught ReferenceError: PreventIt is not defined
URL: https://mydomain/openemr/interface/billing/search_payments.php
Line: 1071 Column: 168
Error object: “{ }”

OpenEMR Version
I’m using OpenEMR version 6.0.0

Browser:
I’m using: Chromium 88.0.4324.182 and have tried Firefox 85.0.1 as well.

Operating System
I’m using: Ubuntu 20

Logs
I’m not quite sure how to view logs.

If anyone can point me in the right direction to troubleshoot this, I would appreciate the help.

Here is something I just recalled while trying to figure out what’s going on here:
During installation I discovered that Ubuntu 20 has no php-gettext available.
I have no idea what php-gettext does, but perhaps its absence is at the root of this problem. Anyone familiar with this stuff think that’s possible?