After a little research I was able to fix this myself:
<!-- Lock the screen on Ctrl + Alt + l-->
<keybind key="C-A-l">
<action name="Execute">
<command>lxlock</command>
</action>
</keybind>
** Attachment added: "calling lxlock instead of xscreensaver-command"
https://bugs.launchpad.net/ubuntu/+source/lubuntu-default-settings/+bug/1204052/+attachment/3746458/+files/rc.xml
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https://bugs.launchpad.net/bugs/1204052
Title:
Keybind to lock screen still using removed xscreensaver-command
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