How can I lock screen on lxde

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First (in a terminal) start your editor: 
vi ~/.config/openbox/lubuntu-rc.xml

Then search for the mentioned faulty code:

<keybind key="C-A-L">          <action name="Execute">              <command>xscreensaver-command -lock</command>          </action>      </keybind>

and change it to use the dm-tool:

<keybind key="C-A-L">          <action name="Execute">              <command>dm-tool lock</command>          </action>      </keybind>

Then add a section, so the Windows+L combination works too:

<keybind key="W-L">    <action name="Execute">              <command>dm-tool lock</command>          </action>      </keybind>

Finally, finish the editor (saving the file) and activate it:

openbox --reconfigure
Good luck




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