The root user and at least one normal user can be added during install using data supplied in the control file. User data and passwords (encrypted or in clear text) are part of the configure resource in the control file.

At least the root user should be configured during auto-installation, which will insure you will be able to login after installation is finished and of course it will insure nobody else can login into the system (in case the password is not set).

The two users in the following example are added during system configuration.

              

...
   <users config:type="list">
      <user>
         <username>root</username>
         <user_password>password</user_password>
         <encrypted config:type="boolean">true</encrypted>
         <forename/>
         <surname/>
      </user>
      <user>
         <username>nashif</username>
         <user_password>password</user_password>
         <encrypted config:type="boolean">true</encrypted>
         <forename>Anas</forename>
         <surname>Nashif</surname>	  	
      </user>
   </users>
...

          

The last example shows the minimal information required for adding users. More options are available for a more customized user account management. The data in /etc/default/useradd is used to determine the home directory of the user to be created in addition to other parameters.