/usr/bin/lxde-logout is in lxde-common 0.5.0-4ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 | #!/bin/sh
lxsession-logout --banner "/usr/share/lxde/images/logout-banner.png" --side=top
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