Either just before the install to disk happens or just after reboot, if you used the AI installer, you will be prompted for the various typical sysconfig questions, if you have not preconfigured the system. The prompts seem very similar to the old OS ones, so it is easy to get caught by one of the following issues:
Don't choose Automatically for your networking type choice, unless you are installing to a laptop or workstation. This choice used to mean simply use DHCP for networking. Unfortunately, it now has the additional meaning of locking you into a
netadmprofile. This will make it impossible to make permanent changes to networking until you disable it. See Chapter 4, Networking Nuts and Bolts, for more details.Don't set up a user account if you want to use root directly. The installer will prompt you for a root password, and also a user account name and password. If you create a user account through this menu option, it will then make the root account unusable...