I managed to get some journalctl entries related with the gdm starting

abr 09 20:54:01 testuser-VirtualBox generate-config[699]: warning: Failed to 
read keyfile '/usr/share/gdm/dconf/90-debian-settings': Key file does not start 
with a group
abr 09 20:54:01 testuser-VirtualBox systemd[1]: gdm.service: Control process 
exited, code=exited status=1
abr 09 20:54:01 testuser-VirtualBox systemd[1]: gdm.service: Failed with result 
abr 09 20:54:01 testuser-VirtualBox systemd[1]: Failed to start GNOME Display 

The file '/usr/share/gdm/dconf/90-debian-settings' is an softlink to the file 
'/etc/gdm3/greeter.dconf-defaults' and suddenly I realized that this is not a 
bug: it's my fault from the beginning!!! :(

There is another line that must be also uncommented in order to get it
to run, the previous 'group one':



   # disable-user-list=true

After uncommented both lines the greeter works as expected in Ubuntu
18.04 beta 2: asking for the user instead of showing a list.

But in Ubuntu 17.10 it's still showing the users list. So I think it's
fixed in Ubuntu 18.04 Beta 2.

Sorry for the inconveniences.

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  gdm3 doesn't start with disable-user-list=true option enabled

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