This file is indexed.

/usr/share/ubuntu-release-upgrader/gtkbuilder/ReleaseNotes.ui is in ubuntu-release-upgrader-gtk 1:0.220.10.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <!-- interface-requires gtk+ 3.0 -->
  <object class="GtkDialog" id="dialog_release_notes">
    <property name="can_focus">False</property>
    <property name="border_width">6</property>
    <property name="title" translatable="yes">Release Notes</property>
    <property name="modal">True</property>
    <property name="window_position">center-on-parent</property>
    <property name="default_width">600</property>
    <property name="default_height">500</property>
    <property name="type_hint">dialog</property>
    <child internal-child="vbox">
      <object class="GtkBox" id="dialog-vbox">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <property name="orientation">vertical</property>
        <property name="spacing">6</property>
        <child internal-child="action_area">
          <object class="GtkButtonBox" id="dialog-action_area">
            <property name="can_focus">False</property>
            <child>
              <object class="GtkButton" id="okbutton1">
                <property name="label">gtk-cancel</property>
                <property name="use_action_appearance">False</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="can_default">True</property>
                <property name="receives_default">True</property>
                <property name="use_action_appearance">False</property>
                <property name="use_stock">True</property>
              </object>
              <packing>
                <property name="expand">False</property>
                <property name="fill">False</property>
                <property name="position">0</property>
              </packing>
            </child>
            <child>
              <object class="GtkButton" id="button2">
                <property name="label" translatable="yes">_Upgrade</property>
                <property name="use_action_appearance">False</property>
                <property name="visible">True</property>
                <property name="can_focus">True</property>
                <property name="can_default">True</property>
                <property name="has_default">True</property>
                <property name="receives_default">True</property>
                <property name="use_action_appearance">False</property>
                <property name="use_underline">True</property>
              </object>
              <packing>
                <property name="expand">False</property>
                <property name="fill">False</property>
                <property name="position">1</property>
              </packing>
            </child>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="pack_type">end</property>
            <property name="position">0</property>
          </packing>
        </child>
        <child>
          <object class="GtkScrolledWindow" id="scrolled_notes">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <property name="border_width">6</property>
            <property name="shadow_type">in</property>
            <child>
              <placeholder/>
            </child>
          </object>
          <packing>
            <property name="expand">True</property>
            <property name="fill">True</property>
            <property name="position">1</property>
          </packing>
        </child>
      </object>
    </child>
    <action-widgets>
      <action-widget response="-6">okbutton1</action-widget>
      <action-widget response="-5">button2</action-widget>
    </action-widgets>
  </object>
</interface>