Thomas,

"We want a user list *and* we want the ability to enter a user-name by
hand" - could you define who "we" are and some use-cases where you have
a list of users and and also other accounts not in the list but useful
to log in as?

LightDM (and by extension Unity Greeter) assumes if the OS provides a
list of user accounts (via getpwent()) then that provides all the
possible accounts available on that system.  From the getpwent manual
page:

"The getpwent() function returns a pointer to a structure containing the
broken-out fields of a record from the password database (e.g., the
local password file /etc/passwd, NIS, and LDAP)"

The "greeter-hide-users" option in lightdm.conf requests that the
greeter hide the list of users (even if it is provided by the OS) and
instead show a manual entry.  The emphasis is not on showing the manual
entry, that is merely what the greeter does if there appears to be no
users on the system (bug 919298 fixed this).  It's not a "show user-name
entry" option.

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https://bugs.launchpad.net/bugs/844044

Title:
  Unity Greeter - Add Network Login option

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