kickstart problems

[tuxico tuxico]

hello ubuntu addicts,

I have to install ubuntu on many computers, so I tried to manage it
with KickStart.
everything works fine (NIS, keyboard...) but for the creation of a
root and user account, I can't make it work.

I tried with :

passwd		passwd/root-password		password r
passwd		passwd/root-password-again      password r
passwd		passwd/user-fullname		string Staff
passwd		passwd/username			string staff
passwd		passwd/user-password		password s
passwd		passwd/user-password-again	password s
=> with the debian-style (d-i), it is like i wrote nothing, ubuntu ask
me to create a user account, like in a manual installation

rootpw r
user staff --fullname "staff" --password s
=> with the kickstart-style, the installation is stucked during the
creation of the account

anybody managed to make this working ?
thanks in advance.