installer let us choose a system user as our primary user account, without warning

We just now installed a quantal MAAS server via USB key from this image: 4bd3270bde86d7e4e017e3847a4af485 ubuntu-12.10-server-amd64.iso

We successfully made it through the installation (creating a new MAAS) and rebooted. However, when logging in via ssh or at the console, we get kicked out because /home/maas (our chosen username) does not exist. The password succeeds. Here's an example via SSH:

 $ ssh <email address hidden>
 <email address hidden>'s password:

 The programs included with the Ubuntu system are free software;
 the exact distribution terms for each program are described in the
 individual files in /usr/share/doc/*/copyright.

 Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
 applicable law.

 Welcome to Ubuntu 12.10 (GNU/Linux 3.5.0-17-generic x86_64)

  * Documentation: https://help.ubuntu.com/

 The programs included with the Ubuntu system are free software;
 the exact distribution terms for each program are described in the
 individual files in /usr/share/doc/*/copyright.

 Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
 applicable law.

 Could not chdir to home directory /home/maas: No such file or directory
 Connection to my-maas.example.com closed.