This is a risk because people can see which user(s) there are available on a system.
This behavior can be changed by the following command:
su -
gconftool-2 --config-source xml:readwrite:/etc/gconf/gconf.xml.defaults --direct --type bool --set /apps/gdm/simple-greeter/disable_user_list true
With this the "normal" login screen is returned.
Only the "others" is still availbale for selection
You need to know the username and the password B-)
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