The message for the unsupported browser can be updated by going to:
  1. Navigate to Core, hover over Settings, and click Labels & Text
  2. Select Custom Text/Messages

  3. Find the notification for Unsupported Browser Message and click Edit
Leave the text field blank to return the default text to the user, or insert custom text to display.
At this time there is no permanent solution for removing this message for Linux users. Users will be able to use our software, but they may receive the error message when attempting to log in.