creating gnome ubuntu live distro: "GDM and user issues"

[Davide Marchi]

Hi friends,
I'm building a custom live Ubuntu Gnome 3.12.2 based,
**Only** if I create a new user, set password and add him to sudo group,

setting by dpkg-reconfigure, GDM ad default greeter, obtain a black 
screen and going to the first console appear  "authentication failure" 
message.

otherwise,
using dpkg-reconfigure and select the Lightdm as default greeter all 
work fine: the greeter show the login screen and the user is able to 
authenticate.

Instead
if I do not use any user, and set GDM ad default greeter, all work fine, 
but no login screen appear and the user goes directly to its desktop.


For build the iso I'm using the Ubuntu directive: 
https://help.ubuntu.com/community/LiveCDCustomization

Could you help me find a solution to this problem?


many thanks!



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firma

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