Comment 3 for bug 944041

I indeed edited /etc/lightdm/lightdm.conf :
    [SeatDefaults]
    user-session=ubuntu
    greeter-session=unity-greeter
    allow-guest=false
    greeter-hide-users=true

Now at least I get a field for a username. Of course, it should just work with LDAP, and pick the usernames
there. Also, when there are many usernames (say more than 10), it should default to either not show them,
or to only the ones who recently logged in to this particular workstation. There may be hundreds or even
thousands of users in an LDAP server. But a particular workstation in a professor's room, only one or two may
actually use that machine. At least the console, people may of course log in with ssh, or vnc, or xdmcp.
Also, in a classroom where many student may use a machine, it may be not sensible to show all users, so if many
different people use a machine, say more than ten, lightdm could also decide to only show a username field.

In all those cases, simply displaying `Other...´ is just silly. There is a real use-case for a normal username/password dialog.

So. the confusing `Other...´ issue remains, and also the fact that at least under kvm (with the cirrus driver), many desktops
will not start. At least not: ubuntu, ubuntu2D, gnome shell, cinnamon. I get a black screen, or a spinner with nothing happening.