Comment 9 for bug 206924

Ubuntu devs maybe wanna hear of it in GDM as it would be much much more simple?
Xfce maybe wont do this since its Ubuntu specific feature.
In Ubuntu there is button Guest. And it can be switched to guest.
Also when user is locked then in log in menu there is button Guest.
In Xubuntu locking user is possible with Adding button Switch User to panel (newbies wont know that) and this Guest account can be made but as i tryd and made it without password i couldnot log in in this myself made Guest account without password thrue log in screen. (Maybe this needs reported as bug also- not possible to log in passwordless accounts without password)
So at least lock user button can be added to xubuntu shutdown menu and in log in menu a button could be made available called Guest.
What your ideas?