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> -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1286686 Title: Lock screen shortcut is not working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lxsession/+bug/1286686/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs