Thanks Danny. After changing from the default in Alt/Win keys to a different setting also marked default - not to be confused with the third setting marked default) I can now set <mod4>+l to lock my screen.
Like Demon, this doesn't actually work. Thankfully the upstream bug explains it. There are two bugs here: - A default that is different to what we expected in the keyboard defaults; and - Gnome not carrying out some functions set using the Windows key. -- Cannot use Windows key in keyboard shortcuts https://launchpad.net/bugs/12153 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
