This works for me:
dm-tool lock

Edit the File: ~/.config/openbox/lubuntu-rc.xml (line to be changed added for 
clarity)

     <!-- Lock the screen on Ctrl + Alt + l-->
     <keybind key="C-A-l">
       <action name="Execute">

         <command>dm-tool lock</command>
         <!-- <command>lxsession-default lock</command> -->

       </action>
     </keybind>

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https://bugs.launchpad.net/bugs/1286686

Title:
  Lock screen shortcut is not working

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