Don't launch a file manager on Ctrl + Alt + D, because that already shows the desktop in LXQt.

debian/changelog

@@ -1,6 +1,8 @@
 lubuntu-default-settings (1.4) UNRELEASED; urgency=medium
 
   * Remove /usr/share/applications; these files are native in LXQt.
+  * Don't launch a file manager on Ctrl + Alt + D, because that already
+    shows the desktop in LXQt.
 
  -- Simon Quigley <tsimonq2@ubuntu.com>  Fri, 20 Jul 2018 01:28:38 -0500
 

src/etc/xdg/xdg-Lubuntu/openbox/lxqt-rc.xml

@@ -419,17 +419,6 @@
     </action>
   </keybind>
 
-  <!-- Launch a filemanager on Ctrl + Alt + D-->
-  <keybind key="C-A-D">
-    <action name="Execute">
-      <startupnotify>
-        <enabled>true</enabled>
-        <name>PCManFM</name>
-      </startupnotify>
-      <command>pcmanfm-qt</command>
-    </action>
-  </keybind>
-
   <!-- Lock the screen on Ctrl + Alt + l-->
   <!--
   <keybind key="C-A-l">