If you already have some lxlock file in /usr/local/bin directory before doing the workaround mentioned in comment #35, it may fail. You may want to delete the old lxlock in /usr/local/bin/ before trying the workaround.
If you already have some lxlock file in /usr/local/bin directory before doing the workaround mentioned in comment #35, it may fail. You may want to delete the old lxlock in /usr/local/bin/ before trying the workaround.