What we all actually want, configuration-wise is some combination of
these three (four?) directives in /etc/lightdm/lightdm.conf:

greeter-hide-users
greeter-show-manual-login
greeter-allow-guest
allow-guest

I've kept greeter-hide-users as true, but they don't show NIS users, nor
does it appear to show recent logins, either. Probably useless on the
network, therefore. greeter-show-manual-login lists a user called
"Login", which allows a user name to be entered. I guess, given the
brevity of the interface design, that 'Login' would be a bit confusing,
but it's not a huge leap of lateral thinking to have simply renamed that
option, 'Someone else...'. I guess dropping it by default is just what
happens when you optimise for new users at the expense of everyone else.

greeter-allow-guest and allow-guest seem to be redundant. Perhaps there
is some way to start a guest session from the greeter even though the
greeter displays no means to do so. Who knows? The only docs we have is
an example config file with some comments in it, all of which may be
wildly out of date. I set both to false to banish that nonsense in my
networked environment.

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https://bugs.launchpad.net/bugs/917144

Title:
  Other ... option is missing

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