netbox-community-netbox/netbox/templates/exceptions/permission_error.html

{% extends '500.html' %}

{% block message %}
    <p>
        A file permission error was detected while processing this request. Common causes include the following:
    </p>
    <p>
        <i class="fa fa-warning"></i> <strong>Insufficient write permission to the media root</strong> - The configured
        media root is <code>{{ settings.MEDIA_ROOT }}</code>. Ensure that the user NetBox runs as has access to write
        files to all locations within this path.
    </p>
{% endblock %}